39 files changed, 5296 insertions, 0 deletions
diff --git a/test/fetch/407-statuscode-window-null.js b/test/fetch/407-statuscode-window-null.js
new file mode 100644
index 0000000..e22554f
--- /dev/null
+++ b/test/fetch/407-statuscode-window-null.js
@@ -0,0 +1,20 @@
+'use strict'
+
+const { fetch } = require('../..')
+const { createServer } = require('http')
+const { once } = require('events')
+const { test } = require('tap')
+
+test('Receiving a 407 status code w/ a window option present should reject', async (t) => {
+  const server = createServer((req, res) => {
+    res.statusCode = 407
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  // if init.window exists, the spec tells us to set request.window to 'no-window',
+  // which later causes the request to be rejected if the status code is 407
+  await t.rejects(fetch(`http://localhost:${server.address().port}`, { window: null }))
+})
diff --git a/test/fetch/abort.js b/test/fetch/abort.js
new file mode 100644
index 0000000..e1ca1eb
--- /dev/null
+++ b/test/fetch/abort.js
@@ -0,0 +1,82 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+const { createServer } = require('http')
+const { once } = require('events')
+const { DOMException } = require('../../lib/fetch/constants')
+const { nodeMajor } = require('../../lib/core/util')
+
+const { AbortController: NPMAbortController } = require('abort-controller')
+
+test('Allow the usage of custom implementation of AbortController', async (t) => {
+  const body = {
+    fixes: 1605
+  }
+
+  const server = createServer((req, res) => {
+    res.statusCode = 200
+    res.end(JSON.stringify(body))
+  })
+
+  t.teardown(server.close.bind(server))
+
+  server.listen(0)
+  await once(server, 'listening')
+
+  const controller = new NPMAbortController()
+  const signal = controller.signal
+  controller.abort()
+
+  try {
+    await fetch(`http://localhost:${server.address().port}`, {
+      signal
+    })
+  } catch (e) {
+    t.equal(e.code, DOMException.ABORT_ERR)
+  }
+})
+
+test('allows aborting with custom errors', { skip: nodeMajor === 16 }, async (t) => {
+  const server = createServer().listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  t.test('Using AbortSignal.timeout with cause', async (t) => {
+    t.plan(2)
+
+    try {
+      await fetch(`http://localhost:${server.address().port}`, {
+        signal: AbortSignal.timeout(50)
+      })
+      t.fail('should throw')
+    } catch (err) {
+      if (err.name === 'TypeError') {
+        const cause = err.cause
+        t.equal(cause.name, 'HeadersTimeoutError')
+        t.equal(cause.code, 'UND_ERR_HEADERS_TIMEOUT')
+      } else if (err.name === 'TimeoutError') {
+        t.equal(err.code, DOMException.TIMEOUT_ERR)
+        t.equal(err.cause, undefined)
+      } else {
+        t.error(err)
+      }
+    }
+  })
+
+  t.test('Error defaults to an AbortError DOMException', async (t) => {
+    const ac = new AbortController()
+    ac.abort() // no reason
+
+    await t.rejects(
+      fetch(`http://localhost:${server.address().port}`, {
+        signal: ac.signal
+      }),
+      {
+        name: 'AbortError',
+        code: DOMException.ABORT_ERR
+      }
+    )
+  })
+})
diff --git a/test/fetch/abort2.js b/test/fetch/abort2.js
new file mode 100644
index 0000000..5f3853b
--- /dev/null
+++ b/test/fetch/abort2.js
@@ -0,0 +1,60 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+const { createServer } = require('http')
+const { once } = require('events')
+const { DOMException } = require('../../lib/fetch/constants')
+
+/* global AbortController */
+
+test('parallel fetch with the same AbortController works as expected', async (t) => {
+  const body = {
+    fixes: 1389,
+    bug: 'Ensure request is not aborted before enqueueing bytes into stream.'
+  }
+
+  const server = createServer((req, res) => {
+    res.statusCode = 200
+    res.end(JSON.stringify(body))
+  })
+
+  t.teardown(server.close.bind(server))
+
+  const abortController = new AbortController()
+
+  async function makeRequest () {
+    const result = await fetch(`http://localhost:${server.address().port}`, {
+      signal: abortController.signal
+    }).then(response => response.json())
+
+    abortController.abort()
+    return result
+  }
+
+  server.listen(0)
+  await once(server, 'listening')
+
+  const requests = Array.from({ length: 10 }, makeRequest)
+  const result = await Promise.allSettled(requests)
+
+  // since the requests are running parallel, any of them could resolve first.
+  // therefore we cannot rely on the order of the requests sent.
+  const { resolved, rejected } = result.reduce((a, b) => {
+    if (b.status === 'rejected') {
+      a.rejected.push(b)
+    } else {
+      a.resolved.push(b)
+    }
+
+    return a
+  }, { resolved: [], rejected: [] })
+
+  t.equal(rejected.length, 9) // out of 10 requests, only 1 should succeed
+  t.equal(resolved.length, 1)
+
+  t.ok(rejected.every(rej => rej.reason?.code === DOMException.ABORT_ERR))
+  t.same(resolved[0].value, body)
+
+  t.end()
+})
diff --git a/test/fetch/about-uri.js b/test/fetch/about-uri.js
new file mode 100644
index 0000000..ac9cbf2
--- /dev/null
+++ b/test/fetch/about-uri.js
@@ -0,0 +1,21 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+
+test('fetching about: uris', async (t) => {
+  t.test('about:blank', async (t) => {
+    await t.rejects(fetch('about:blank'))
+  })
+
+  t.test('All other about: urls should return an error', async (t) => {
+    try {
+      await fetch('about:config')
+      t.fail('fetching about:config should fail')
+    } catch (e) {
+      t.ok(e, 'this error was expected')
+    } finally {
+      t.end()
+    }
+  })
+})
diff --git a/test/fetch/blob-uri.js b/test/fetch/blob-uri.js
new file mode 100644
index 0000000..f9db96c
--- /dev/null
+++ b/test/fetch/blob-uri.js
@@ -0,0 +1,100 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+const { Blob } = require('buffer')
+
+test('fetching blob: uris', async (t) => {
+  const blobContents = 'hello world'
+  /** @type {import('buffer').Blob} */
+  let blob
+  /** @type {string} */
+  let objectURL
+
+  t.beforeEach(() => {
+    blob = new Blob([blobContents])
+    objectURL = URL.createObjectURL(blob)
+  })
+
+  t.test('a normal fetch request works', async (t) => {
+    const res = await fetch(objectURL)
+
+    t.equal(blobContents, await res.text())
+    t.equal(blob.type, res.headers.get('Content-Type'))
+    t.equal(`${blob.size}`, res.headers.get('Content-Length'))
+    t.end()
+  })
+
+  t.test('non-GET method to blob: fails', async (t) => {
+    try {
+      await fetch(objectURL, {
+        method: 'POST'
+      })
+      t.fail('expected POST to blob: uri to fail')
+    } catch (e) {
+      t.ok(e, 'Got the expected error')
+    } finally {
+      t.end()
+    }
+  })
+
+  // https://github.com/web-platform-tests/wpt/blob/7b0ebaccc62b566a1965396e5be7bb2bc06f841f/FileAPI/url/resources/fetch-tests.js#L36-L41
+  t.test('fetching revoked URL should fail', async (t) => {
+    URL.revokeObjectURL(objectURL)
+
+    try {
+      await fetch(objectURL)
+      t.fail('expected revoked blob: url to fail')
+    } catch (e) {
+      t.ok(e, 'Got the expected error')
+    } finally {
+      t.end()
+    }
+  })
+
+  // https://github.com/web-platform-tests/wpt/blob/7b0ebaccc62b566a1965396e5be7bb2bc06f841f/FileAPI/url/resources/fetch-tests.js#L28-L34
+  t.test('works with a fragment', async (t) => {
+    const res = await fetch(objectURL + '#fragment')
+
+    t.equal(blobContents, await res.text())
+    t.end()
+  })
+
+  // https://github.com/web-platform-tests/wpt/blob/7b0ebaccc62b566a1965396e5be7bb2bc06f841f/FileAPI/url/resources/fetch-tests.js#L52-L56
+  t.test('Appending a query string to blob: url should cause fetch to fail', async (t) => {
+    try {
+      await fetch(objectURL + '?querystring')
+      t.fail('expected ?querystring blob: url to fail')
+    } catch (e) {
+      t.ok(e, 'Got the expected error')
+    } finally {
+      t.end()
+    }
+  })
+
+  // https://github.com/web-platform-tests/wpt/blob/7b0ebaccc62b566a1965396e5be7bb2bc06f841f/FileAPI/url/resources/fetch-tests.js#L58-L62
+  t.test('Appending a path should cause fetch to fail', async (t) => {
+    try {
+      await fetch(objectURL + '/path')
+      t.fail('expected /path blob: url to fail')
+    } catch (e) {
+      t.ok(e, 'Got the expected error')
+    } finally {
+      t.end()
+    }
+  })
+
+  // https://github.com/web-platform-tests/wpt/blob/7b0ebaccc62b566a1965396e5be7bb2bc06f841f/FileAPI/url/resources/fetch-tests.js#L64-L70
+  t.test('these http methods should fail', async (t) => {
+    for (const method of ['HEAD', 'POST', 'DELETE', 'OPTIONS', 'PUT', 'CUSTOM']) {
+      try {
+        await fetch(objectURL, { method })
+        t.fail(`${method} fetch should have failed`)
+      } catch (e) {
+        t.ok(e, `${method} blob url - test succeeded`)
+      }
+    }
+
+    t.end()
+  })
+})
diff --git a/test/fetch/bundle.js b/test/fetch/bundle.js
new file mode 100644
index 0000000..aa1257a
--- /dev/null
+++ b/test/fetch/bundle.js
@@ -0,0 +1,41 @@
+'use strict'
+
+const { test, skip } = require('tap')
+const { nodeMajor } = require('../../lib/core/util')
+
+if (nodeMajor === 16) {
+  skip('esbuild uses static blocks with --keep-names which node 16.8 does not have')
+  process.exit()
+}
+
+const { Response, Request, FormData, Headers } = require('../../undici-fetch')
+
+test('bundle sets constructor.name and .name properly', (t) => {
+  t.equal(new Response().constructor.name, 'Response')
+  t.equal(Response.name, 'Response')
+
+  t.equal(new Request('http://a').constructor.name, 'Request')
+  t.equal(Request.name, 'Request')
+
+  t.equal(new Headers().constructor.name, 'Headers')
+  t.equal(Headers.name, 'Headers')
+
+  t.equal(new FormData().constructor.name, 'FormData')
+  t.equal(FormData.name, 'FormData')
+
+  t.end()
+})
+
+test('regression test for https://github.com/nodejs/node/issues/50263', (t) => {
+  const request = new Request('https://a', {
+    headers: {
+      test: 'abc'
+    },
+    method: 'POST'
+  })
+
+  const request1 = new Request(request, { body: 'does not matter' })
+
+  t.equal(request1.headers.get('test'), 'abc')
+  t.end()
+})
diff --git a/test/fetch/client-error-stack-trace.js b/test/fetch/client-error-stack-trace.js
new file mode 100644
index 0000000..7d94aa8
--- /dev/null
+++ b/test/fetch/client-error-stack-trace.js
@@ -0,0 +1,21 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+const { fetch: fetchIndex } = require('../../index-fetch')
+
+test('FETCH: request errors and prints trimmed stack trace', async (t) => {
+  try {
+    await fetch('http://a.com')
+  } catch (error) {
+    t.match(error.stack, `at Test.<anonymous> (${__filename}`)
+  }
+})
+
+test('FETCH-index: request errors and prints trimmed stack trace', async (t) => {
+  try {
+    await fetchIndex('http://a.com')
+  } catch (error) {
+    t.match(error.stack, `at Test.<anonymous> (${__filename}`)
+  }
+})
diff --git a/test/fetch/client-fetch.js b/test/fetch/client-fetch.js
new file mode 100644
index 0000000..9009d54
--- /dev/null
+++ b/test/fetch/client-fetch.js
@@ -0,0 +1,688 @@
+/* globals AbortController */
+
+'use strict'
+
+const { test, teardown } = require('tap')
+const { createServer } = require('http')
+const { ReadableStream } = require('stream/web')
+const { Blob } = require('buffer')
+const { fetch, Response, Request, FormData, File } = require('../..')
+const { Client, setGlobalDispatcher, Agent } = require('../..')
+const { nodeMajor, nodeMinor } = require('../../lib/core/util')
+const nodeFetch = require('../../index-fetch')
+const { once } = require('events')
+const { gzipSync } = require('zlib')
+const { promisify } = require('util')
+const { randomFillSync, createHash } = require('crypto')
+
+setGlobalDispatcher(new Agent({
+  keepAliveTimeout: 1,
+  keepAliveMaxTimeout: 1
+}))
+
+test('function signature', (t) => {
+  t.plan(2)
+
+  t.equal(fetch.name, 'fetch')
+  t.equal(fetch.length, 1)
+})
+
+test('args validation', async (t) => {
+  t.plan(2)
+
+  await t.rejects(fetch(), TypeError)
+  await t.rejects(fetch('ftp://unsupported'), TypeError)
+})
+
+test('request json', (t) => {
+  t.plan(1)
+
+  const obj = { asd: true }
+  const server = createServer((req, res) => {
+    res.end(JSON.stringify(obj))
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const body = await fetch(`http://localhost:${server.address().port}`)
+    t.strictSame(obj, await body.json())
+  })
+})
+
+test('request text', (t) => {
+  t.plan(1)
+
+  const obj = { asd: true }
+  const server = createServer((req, res) => {
+    res.end(JSON.stringify(obj))
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const body = await fetch(`http://localhost:${server.address().port}`)
+    t.strictSame(JSON.stringify(obj), await body.text())
+  })
+})
+
+test('request arrayBuffer', (t) => {
+  t.plan(1)
+
+  const obj = { asd: true }
+  const server = createServer((req, res) => {
+    res.end(JSON.stringify(obj))
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const body = await fetch(`http://localhost:${server.address().port}`)
+    t.strictSame(Buffer.from(JSON.stringify(obj)), Buffer.from(await body.arrayBuffer()))
+  })
+})
+
+test('should set type of blob object to the value of the `Content-Type` header from response', (t) => {
+  t.plan(1)
+
+  const obj = { asd: true }
+  const server = createServer((req, res) => {
+    res.setHeader('Content-Type', 'application/json')
+    res.end(JSON.stringify(obj))
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const response = await fetch(`http://localhost:${server.address().port}`)
+    t.equal('application/json', (await response.blob()).type)
+  })
+})
+
+test('pre aborted with readable request body', (t) => {
+  t.plan(2)
+
+  const server = createServer((req, res) => {
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const ac = new AbortController()
+    ac.abort()
+    await fetch(`http://localhost:${server.address().port}`, {
+      signal: ac.signal,
+      method: 'POST',
+      body: new ReadableStream({
+        async cancel (reason) {
+          t.equal(reason.name, 'AbortError')
+        }
+      }),
+      duplex: 'half'
+    }).catch(err => {
+      t.equal(err.name, 'AbortError')
+    })
+  })
+})
+
+test('pre aborted with closed readable request body', (t) => {
+  t.plan(2)
+
+  const server = createServer((req, res) => {
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const ac = new AbortController()
+    ac.abort()
+    const body = new ReadableStream({
+      async start (c) {
+        t.pass()
+        c.close()
+      },
+      async cancel (reason) {
+        t.fail()
+      }
+    })
+    queueMicrotask(() => {
+      fetch(`http://localhost:${server.address().port}`, {
+        signal: ac.signal,
+        method: 'POST',
+        body,
+        duplex: 'half'
+      }).catch(err => {
+        t.equal(err.name, 'AbortError')
+      })
+    })
+  })
+})
+
+test('unsupported formData 1', (t) => {
+  t.plan(1)
+
+  const server = createServer((req, res) => {
+    res.setHeader('content-type', 'asdasdsad')
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, () => {
+    fetch(`http://localhost:${server.address().port}`)
+      .then(res => res.formData())
+      .catch(err => {
+        t.equal(err.name, 'TypeError')
+      })
+  })
+})
+
+test('multipart formdata not base64', async (t) => {
+  t.plan(2)
+  // Construct example form data, with text and blob fields
+  const formData = new FormData()
+  formData.append('field1', 'value1')
+  const blob = new Blob(['example\ntext file'], { type: 'text/plain' })
+  formData.append('field2', blob, 'file.txt')
+
+  const tempRes = new Response(formData)
+  const boundary = tempRes.headers.get('content-type').split('boundary=')[1]
+  const formRaw = await tempRes.text()
+
+  const server = createServer((req, res) => {
+    res.setHeader('content-type', 'multipart/form-data; boundary=' + boundary)
+    res.write(formRaw)
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  const listen = promisify(server.listen.bind(server))
+  await listen(0)
+
+  const res = await fetch(`http://localhost:${server.address().port}`)
+  const form = await res.formData()
+  t.equal(form.get('field1'), 'value1')
+
+  const text = await form.get('field2').text()
+  t.equal(text, 'example\ntext file')
+})
+
+// TODO(@KhafraDev): re-enable this test once the issue is fixed
+// See https://github.com/nodejs/node/issues/47301
+test('multipart formdata base64', { skip: nodeMajor >= 19 && nodeMinor >= 8 }, (t) => {
+  t.plan(1)
+
+  // Example form data with base64 encoding
+  const data = randomFillSync(Buffer.alloc(256))
+  const formRaw = `------formdata-undici-0.5786922755719377\r\nContent-Disposition: form-data; name="file"; filename="test.txt"\r\nContent-Type: application/octet-stream\r\nContent-Transfer-Encoding: base64\r\n\r\n${data.toString('base64')}\r\n------formdata-undici-0.5786922755719377--`
+  const server = createServer(async (req, res) => {
+    res.setHeader('content-type', 'multipart/form-data; boundary=----formdata-undici-0.5786922755719377')
+
+    for (let offset = 0; offset < formRaw.length;) {
+      res.write(formRaw.slice(offset, offset += 2))
+      await new Promise(resolve => setTimeout(resolve))
+    }
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, () => {
+    fetch(`http://localhost:${server.address().port}`)
+      .then(res => res.formData())
+      .then(form => form.get('file').arrayBuffer())
+      .then(buffer => createHash('sha256').update(Buffer.from(buffer)).digest('base64'))
+      .then(digest => {
+        t.equal(createHash('sha256').update(data).digest('base64'), digest)
+      })
+  })
+})
+
+test('multipart fromdata non-ascii filed names', async (t) => {
+  t.plan(1)
+
+  const request = new Request('http://localhost', {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'multipart/form-data; boundary=----formdata-undici-0.6204674738279623'
+    },
+    body:
+      '------formdata-undici-0.6204674738279623\r\n' +
+      'Content-Disposition: form-data; name="fiŝo"\r\n' +
+      '\r\n' +
+      'value1\r\n' +
+      '------formdata-undici-0.6204674738279623--'
+  })
+
+  const form = await request.formData()
+  t.equal(form.get('fiŝo'), 'value1')
+})
+
+test('busboy emit error', async (t) => {
+  t.plan(1)
+  const formData = new FormData()
+  formData.append('field1', 'value1')
+
+  const tempRes = new Response(formData)
+  const formRaw = await tempRes.text()
+
+  const server = createServer((req, res) => {
+    res.setHeader('content-type', 'multipart/form-data; boundary=wrongboundary')
+    res.write(formRaw)
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  const listen = promisify(server.listen.bind(server))
+  await listen(0)
+
+  const res = await fetch(`http://localhost:${server.address().port}`)
+  await t.rejects(res.formData(), 'Unexpected end of multipart data')
+})
+
+// https://github.com/nodejs/undici/issues/2244
+test('parsing formData preserve full path on files', async (t) => {
+  t.plan(1)
+  const formData = new FormData()
+  formData.append('field1', new File(['foo'], 'a/b/c/foo.txt'))
+
+  const tempRes = new Response(formData)
+  const form = await tempRes.formData()
+
+  t.equal(form.get('field1').name, 'a/b/c/foo.txt')
+})
+
+test('urlencoded formData', (t) => {
+  t.plan(2)
+
+  const server = createServer((req, res) => {
+    res.setHeader('content-type', 'application/x-www-form-urlencoded')
+    res.end('field1=value1&field2=value2')
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, () => {
+    fetch(`http://localhost:${server.address().port}`)
+      .then(res => res.formData())
+      .then(formData => {
+        t.equal(formData.get('field1'), 'value1')
+        t.equal(formData.get('field2'), 'value2')
+      })
+  })
+})
+
+test('text with BOM', (t) => {
+  t.plan(1)
+
+  const server = createServer((req, res) => {
+    res.setHeader('content-type', 'application/x-www-form-urlencoded')
+    res.end('\uFEFFtest=\uFEFF')
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, () => {
+    fetch(`http://localhost:${server.address().port}`)
+      .then(res => res.text())
+      .then(text => {
+        t.equal(text, 'test=\uFEFF')
+      })
+  })
+})
+
+test('formData with BOM', (t) => {
+  t.plan(1)
+
+  const server = createServer((req, res) => {
+    res.setHeader('content-type', 'application/x-www-form-urlencoded')
+    res.end('\uFEFFtest=\uFEFF')
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, () => {
+    fetch(`http://localhost:${server.address().port}`)
+      .then(res => res.formData())
+      .then(formData => {
+        t.equal(formData.get('\uFEFFtest'), '\uFEFF')
+      })
+  })
+})
+
+test('locked blob body', (t) => {
+  t.plan(1)
+
+  const server = createServer((req, res) => {
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const res = await fetch(`http://localhost:${server.address().port}`)
+    const reader = res.body.getReader()
+    res.blob().catch(err => {
+      t.equal(err.message, 'Body is unusable')
+      reader.cancel()
+    })
+  })
+})
+
+test('disturbed blob body', (t) => {
+  t.plan(2)
+
+  const server = createServer((req, res) => {
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const res = await fetch(`http://localhost:${server.address().port}`)
+    res.blob().then(() => {
+      t.pass(2)
+    })
+    res.blob().catch(err => {
+      t.equal(err.message, 'Body is unusable')
+    })
+  })
+})
+
+test('redirect with body', (t) => {
+  t.plan(3)
+
+  let count = 0
+  const server = createServer(async (req, res) => {
+    let body = ''
+    for await (const chunk of req) {
+      body += chunk
+    }
+    t.equal(body, 'asd')
+    if (count++ === 0) {
+      res.setHeader('location', 'asd')
+      res.statusCode = 302
+      res.end()
+    } else {
+      res.end(String(count))
+    }
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const res = await fetch(`http://localhost:${server.address().port}`, {
+      method: 'PUT',
+      body: 'asd'
+    })
+    t.equal(await res.text(), '2')
+  })
+})
+
+test('redirect with stream', (t) => {
+  t.plan(3)
+
+  const location = '/asd'
+  const body = 'hello!'
+  const server = createServer(async (req, res) => {
+    res.writeHead(302, { location })
+    let count = 0
+    const l = setInterval(() => {
+      res.write(body[count++])
+      if (count === body.length) {
+        res.end()
+        clearInterval(l)
+      }
+    }, 50)
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const res = await fetch(`http://localhost:${server.address().port}`, {
+      redirect: 'manual'
+    })
+    t.equal(res.status, 302)
+    t.equal(res.headers.get('location'), location)
+    t.equal(await res.text(), body)
+  })
+})
+
+test('fail to extract locked body', (t) => {
+  t.plan(1)
+
+  const stream = new ReadableStream({})
+  const reader = stream.getReader()
+  try {
+    // eslint-disable-next-line
+    new Response(stream)
+  } catch (err) {
+    t.equal(err.name, 'TypeError')
+  }
+  reader.cancel()
+})
+
+test('fail to extract locked body', (t) => {
+  t.plan(1)
+
+  const stream = new ReadableStream({})
+  const reader = stream.getReader()
+  try {
+    // eslint-disable-next-line
+    new Request('http://asd', {
+      method: 'PUT',
+      body: stream,
+      keepalive: true
+    })
+  } catch (err) {
+    t.equal(err.message, 'keepalive')
+  }
+  reader.cancel()
+})
+
+test('post FormData with Blob', (t) => {
+  t.plan(1)
+
+  const body = new FormData()
+  body.append('field1', new Blob(['asd1']))
+
+  const server = createServer((req, res) => {
+    req.pipe(res)
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const res = await fetch(`http://localhost:${server.address().port}`, {
+      method: 'PUT',
+      body
+    })
+    t.ok(/asd1/.test(await res.text()))
+  })
+})
+
+test('post FormData with File', (t) => {
+  t.plan(2)
+
+  const body = new FormData()
+  body.append('field1', new File(['asd1'], 'filename123'))
+
+  const server = createServer((req, res) => {
+    req.pipe(res)
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const res = await fetch(`http://localhost:${server.address().port}`, {
+      method: 'PUT',
+      body
+    })
+    const result = await res.text()
+    t.ok(/asd1/.test(result))
+    t.ok(/filename123/.test(result))
+  })
+})
+
+test('invalid url', async (t) => {
+  t.plan(1)
+
+  try {
+    await fetch('http://invalid')
+  } catch (e) {
+    t.match(e.cause.message, 'invalid')
+  }
+})
+
+test('custom agent', (t) => {
+  t.plan(2)
+
+  const obj = { asd: true }
+  const server = createServer((req, res) => {
+    res.end(JSON.stringify(obj))
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const dispatcher = new Client('http://localhost:' + server.address().port, {
+      keepAliveTimeout: 1,
+      keepAliveMaxTimeout: 1
+    })
+    const oldDispatch = dispatcher.dispatch
+    dispatcher.dispatch = function (options, handler) {
+      t.pass('custom dispatcher')
+      return oldDispatch.call(this, options, handler)
+    }
+    t.teardown(server.close.bind(server))
+    const body = await fetch(`http://localhost:${server.address().port}`, {
+      dispatcher
+    })
+    t.strictSame(obj, await body.json())
+  })
+})
+
+test('custom agent node fetch', (t) => {
+  t.plan(2)
+
+  const obj = { asd: true }
+  const server = createServer((req, res) => {
+    res.end(JSON.stringify(obj))
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const dispatcher = new Client('http://localhost:' + server.address().port, {
+      keepAliveTimeout: 1,
+      keepAliveMaxTimeout: 1
+    })
+    const oldDispatch = dispatcher.dispatch
+    dispatcher.dispatch = function (options, handler) {
+      t.pass('custom dispatcher')
+      return oldDispatch.call(this, options, handler)
+    }
+    t.teardown(server.close.bind(server))
+    const body = await nodeFetch.fetch(`http://localhost:${server.address().port}`, {
+      dispatcher
+    })
+    t.strictSame(obj, await body.json())
+  })
+})
+
+test('error on redirect', async (t) => {
+  const server = createServer((req, res) => {
+    res.statusCode = 302
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const errorCause = await fetch(`http://localhost:${server.address().port}`, {
+      redirect: 'error'
+    }).catch((e) => e.cause)
+
+    t.equal(errorCause.message, 'unexpected redirect')
+  })
+})
+
+// https://github.com/nodejs/undici/issues/1527
+test('fetching with Request object - issue #1527', async (t) => {
+  const server = createServer((req, res) => {
+    t.pass()
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const body = JSON.stringify({ foo: 'bar' })
+  const request = new Request(`http://localhost:${server.address().port}`, {
+    method: 'POST',
+    body
+  })
+
+  await t.resolves(fetch(request))
+  t.end()
+})
+
+test('do not decode redirect body', (t) => {
+  t.plan(3)
+
+  const obj = { asd: true }
+  const server = createServer((req, res) => {
+    if (req.url === '/resource') {
+      t.pass('we redirect')
+      res.statusCode = 301
+      res.setHeader('location', '/resource/')
+      // Some dumb http servers set the content-encoding gzip
+      // even if there is no response
+      res.setHeader('content-encoding', 'gzip')
+      res.end()
+      return
+    }
+    t.pass('actual response')
+    res.setHeader('content-encoding', 'gzip')
+    res.end(gzipSync(JSON.stringify(obj)))
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const body = await fetch(`http://localhost:${server.address().port}/resource`)
+    t.strictSame(JSON.stringify(obj), await body.text())
+  })
+})
+
+test('decode non-redirect body with location header', (t) => {
+  t.plan(2)
+
+  const obj = { asd: true }
+  const server = createServer((req, res) => {
+    t.pass('response')
+    res.statusCode = 201
+    res.setHeader('location', '/resource/')
+    res.setHeader('content-encoding', 'gzip')
+    res.end(gzipSync(JSON.stringify(obj)))
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const body = await fetch(`http://localhost:${server.address().port}/resource`)
+    t.strictSame(JSON.stringify(obj), await body.text())
+  })
+})
+
+test('Receiving non-Latin1 headers', async (t) => {
+  const ContentDisposition = [
+    'inline; filename=rock&roll.png',
+    'inline; filename="rock\'n\'roll.png"',
+    'inline; filename="image â\x80\x94 copy (1).png"; filename*=UTF-8\'\'image%20%E2%80%94%20copy%20(1).png',
+    'inline; filename="_å\x9C\x96ç\x89\x87_ð\x9F\x96¼_image_.png"; filename*=UTF-8\'\'_%E5%9C%96%E7%89%87_%F0%9F%96%BC_image_.png',
+    'inline; filename="100 % loading&perf.png"; filename*=UTF-8\'\'100%20%25%20loading%26perf.png'
+  ]
+
+  const server = createServer((req, res) => {
+    for (let i = 0; i < ContentDisposition.length; i++) {
+      res.setHeader(`Content-Disposition-${i + 1}`, ContentDisposition[i])
+    }
+
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const url = `http://localhost:${server.address().port}`
+  const response = await fetch(url, { method: 'HEAD' })
+  const cdHeaders = [...response.headers]
+    .filter(([k]) => k.startsWith('content-disposition'))
+    .map(([, v]) => v)
+  const lengths = cdHeaders.map(h => h.length)
+
+  t.same(cdHeaders, ContentDisposition)
+  t.same(lengths, [30, 34, 94, 104, 90])
+  t.end()
+})
+
+teardown(() => process.exit())
diff --git a/test/fetch/client-node-max-header-size.js b/test/fetch/client-node-max-header-size.js
new file mode 100644
index 0000000..737bae8
--- /dev/null
+++ b/test/fetch/client-node-max-header-size.js
@@ -0,0 +1,29 @@
+'use strict'
+
+const { execSync } = require('node:child_process')
+const { test, skip } = require('tap')
+const { nodeMajor } = require('../../lib/core/util')
+
+if (nodeMajor === 16) {
+  skip('esbuild uses static blocks with --keep-names which node 16.8 does not have')
+  process.exit()
+}
+
+const command = 'node -e "require(\'./undici-fetch.js\').fetch(\'https://httpbin.org/get\')"'
+
+test("respect Node.js' --max-http-header-size", async (t) => {
+  t.throws(
+    // TODO: Drop the `--unhandled-rejections=throw` once we drop Node.js 14
+    () => execSync(`${command} --max-http-header-size=1 --unhandled-rejections=throw`),
+    /UND_ERR_HEADERS_OVERFLOW/,
+    'max-http-header-size=1 should throw'
+  )
+
+  t.doesNotThrow(
+    () => execSync(command),
+    /UND_ERR_HEADERS_OVERFLOW/,
+    'default max-http-header-size should not throw'
+  )
+
+  t.end()
+})
diff --git a/test/fetch/content-length.js b/test/fetch/content-length.js
new file mode 100644
index 0000000..9264091
--- /dev/null
+++ b/test/fetch/content-length.js
@@ -0,0 +1,29 @@
+'use strict'
+
+const { test } = require('tap')
+const { createServer } = require('http')
+const { once } = require('events')
+const { Blob } = require('buffer')
+const { fetch, FormData } = require('../..')
+
+// https://github.com/nodejs/undici/issues/1783
+test('Content-Length is set when using a FormData body with fetch', async (t) => {
+  const server = createServer((req, res) => {
+    // TODO: check the length's value once the boundary has a fixed length
+    t.ok('content-length' in req.headers) // request has content-length header
+    t.ok(!Number.isNaN(Number(req.headers['content-length'])))
+    res.end()
+  }).listen(0)
+
+  await once(server, 'listening')
+  t.teardown(server.close.bind(server))
+
+  const fd = new FormData()
+  fd.set('file', new Blob(['hello world 👋'], { type: 'text/plain' }), 'readme.md')
+  fd.set('string', 'some string value')
+
+  await fetch(`http://localhost:${server.address().port}`, {
+    method: 'POST',
+    body: fd
+  })
+})
diff --git a/test/fetch/cookies.js b/test/fetch/cookies.js
new file mode 100644
index 0000000..18b001d
--- /dev/null
+++ b/test/fetch/cookies.js
@@ -0,0 +1,69 @@
+'use strict'
+
+const { once } = require('events')
+const { createServer } = require('http')
+const { test } = require('tap')
+const { fetch, Headers } = require('../..')
+
+test('Can receive set-cookie headers from a server using fetch - issue #1262', async (t) => {
+  const server = createServer((req, res) => {
+    res.setHeader('set-cookie', 'name=value; Domain=example.com')
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const response = await fetch(`http://localhost:${server.address().port}`)
+
+  t.equal(response.headers.get('set-cookie'), 'name=value; Domain=example.com')
+
+  const response2 = await fetch(`http://localhost:${server.address().port}`, {
+    credentials: 'include'
+  })
+
+  t.equal(response2.headers.get('set-cookie'), 'name=value; Domain=example.com')
+
+  t.end()
+})
+
+test('Can send cookies to a server with fetch - issue #1463', async (t) => {
+  const server = createServer((req, res) => {
+    t.equal(req.headers.cookie, 'value')
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const headersInit = [
+    new Headers([['cookie', 'value']]),
+    { cookie: 'value' },
+    [['cookie', 'value']]
+  ]
+
+  for (const headers of headersInit) {
+    await fetch(`http://localhost:${server.address().port}`, { headers })
+  }
+
+  t.end()
+})
+
+test('Cookie header is delimited with a semicolon rather than a comma - issue #1905', async (t) => {
+  t.plan(1)
+
+  const server = createServer((req, res) => {
+    t.equal(req.headers.cookie, 'FOO=lorem-ipsum-dolor-sit-amet; BAR=the-quick-brown-fox')
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  await fetch(`http://localhost:${server.address().port}`, {
+    headers: [
+      ['cookie', 'FOO=lorem-ipsum-dolor-sit-amet'],
+      ['cookie', 'BAR=the-quick-brown-fox']
+    ]
+  })
+})
diff --git a/test/fetch/data-uri.js b/test/fetch/data-uri.js
new file mode 100644
index 0000000..6191bfe
--- /dev/null
+++ b/test/fetch/data-uri.js
@@ -0,0 +1,214 @@
+'use strict'
+
+const { test } = require('tap')
+const {
+  URLSerializer,
+  collectASequenceOfCodePoints,
+  stringPercentDecode,
+  parseMIMEType,
+  collectAnHTTPQuotedString
+} = require('../../lib/fetch/dataURL')
+const { fetch } = require('../..')
+
+test('https://url.spec.whatwg.org/#concept-url-serializer', (t) => {
+  t.test('url scheme gets appended', (t) => {
+    const url = new URL('https://www.google.com/')
+    const serialized = URLSerializer(url)
+
+    t.ok(serialized.startsWith(url.protocol))
+    t.end()
+  })
+
+  t.test('non-null url host with authentication', (t) => {
+    const url = new URL('https://username:password@google.com')
+    const serialized = URLSerializer(url)
+
+    t.ok(serialized.includes(`//${url.username}:${url.password}`))
+    t.ok(serialized.endsWith('@google.com/'))
+    t.end()
+  })
+
+  t.test('null url host', (t) => {
+    for (const url of ['web+demo:/.//not-a-host/', 'web+demo:/path/..//not-a-host/']) {
+      t.equal(
+        URLSerializer(new URL(url)),
+        'web+demo:/.//not-a-host/'
+      )
+    }
+
+    t.end()
+  })
+
+  t.test('url with query works', (t) => {
+    t.equal(
+      URLSerializer(new URL('https://www.google.com/?fetch=undici')),
+      'https://www.google.com/?fetch=undici'
+    )
+
+    t.end()
+  })
+
+  t.test('exclude fragment', (t) => {
+    t.equal(
+      URLSerializer(new URL('https://www.google.com/#frag')),
+      'https://www.google.com/#frag'
+    )
+
+    t.equal(
+      URLSerializer(new URL('https://www.google.com/#frag'), true),
+      'https://www.google.com/'
+    )
+
+    t.end()
+  })
+
+  t.end()
+})
+
+test('https://infra.spec.whatwg.org/#collect-a-sequence-of-code-points', (t) => {
+  const input = 'text/plain;base64,'
+  const position = { position: 0 }
+  const result = collectASequenceOfCodePoints(
+    (char) => char !== ';',
+    input,
+    position
+  )
+
+  t.strictSame(result, 'text/plain')
+  t.strictSame(position.position, input.indexOf(';'))
+  t.end()
+})
+
+test('https://url.spec.whatwg.org/#string-percent-decode', (t) => {
+  t.test('encodes %{2} in range properly', (t) => {
+    const input = '%FF'
+    const percentDecoded = stringPercentDecode(input)
+
+    t.same(percentDecoded, new Uint8Array([255]))
+    t.end()
+  })
+
+  t.test('encodes %{2} not in range properly', (t) => {
+    const input = 'Hello %XD World'
+    const percentDecoded = stringPercentDecode(input)
+    const expected = [...input].map(c => c.charCodeAt(0))
+
+    t.same(percentDecoded, expected)
+    t.end()
+  })
+
+  t.test('normal string works', (t) => {
+    const input = 'Hello world'
+    const percentDecoded = stringPercentDecode(input)
+    const expected = [...input].map(c => c.charCodeAt(0))
+
+    t.same(percentDecoded, Uint8Array.from(expected))
+    t.end()
+  })
+
+  t.end()
+})
+
+test('https://mimesniff.spec.whatwg.org/#parse-a-mime-type', (t) => {
+  t.same(parseMIMEType('text/plain'), {
+    type: 'text',
+    subtype: 'plain',
+    parameters: new Map(),
+    essence: 'text/plain'
+  })
+
+  t.same(parseMIMEType('text/html;charset="shift_jis"iso-2022-jp'), {
+    type: 'text',
+    subtype: 'html',
+    parameters: new Map([['charset', 'shift_jis']]),
+    essence: 'text/html'
+  })
+
+  t.same(parseMIMEType('application/javascript'), {
+    type: 'application',
+    subtype: 'javascript',
+    parameters: new Map(),
+    essence: 'application/javascript'
+  })
+
+  t.end()
+})
+
+test('https://fetch.spec.whatwg.org/#collect-an-http-quoted-string', (t) => {
+  // https://fetch.spec.whatwg.org/#example-http-quoted-string
+  t.test('first', (t) => {
+    const position = { position: 0 }
+
+    t.strictSame(collectAnHTTPQuotedString('"\\', {
+      position: 0
+    }), '"\\')
+    t.strictSame(collectAnHTTPQuotedString('"\\', position, true), '\\')
+    t.strictSame(position.position, 2)
+    t.end()
+  })
+
+  t.test('second', (t) => {
+    const position = { position: 0 }
+    const input = '"Hello" World'
+
+    t.strictSame(collectAnHTTPQuotedString(input, {
+      position: 0
+    }), '"Hello"')
+    t.strictSame(collectAnHTTPQuotedString(input, position, true), 'Hello')
+    t.strictSame(position.position, 7)
+    t.end()
+  })
+
+  t.end()
+})
+
+// https://github.com/nodejs/undici/issues/1574
+test('too long base64 url', async (t) => {
+  const inputStr = 'a'.repeat(1 << 20)
+  const base64 = Buffer.from(inputStr).toString('base64')
+  const dataURIPrefix = 'data:application/octet-stream;base64,'
+  const dataURL = dataURIPrefix + base64
+  try {
+    const res = await fetch(dataURL)
+    const buf = await res.arrayBuffer()
+    const outputStr = Buffer.from(buf).toString('ascii')
+    t.same(outputStr, inputStr)
+  } catch (e) {
+    t.fail(`failed to fetch ${dataURL}`)
+  }
+})
+
+test('https://domain.com/#', (t) => {
+  t.plan(1)
+  const domain = 'https://domain.com/#a'
+  const serialized = URLSerializer(new URL(domain))
+  t.equal(serialized, domain)
+})
+
+test('https://domain.com/?', (t) => {
+  t.plan(1)
+  const domain = 'https://domain.com/?a=b'
+  const serialized = URLSerializer(new URL(domain))
+  t.equal(serialized, domain)
+})
+
+// https://github.com/nodejs/undici/issues/2474
+test('hash url', (t) => {
+  t.plan(1)
+  const domain = 'https://domain.com/#a#b'
+  const url = new URL(domain)
+  const serialized = URLSerializer(url, true)
+  t.equal(serialized, url.href.substring(0, url.href.length - url.hash.length))
+})
+
+// https://github.com/nodejs/undici/issues/2474
+test('data url that includes the hash', async (t) => {
+  t.plan(1)
+  const dataURL = 'data:,node#js#'
+  try {
+    const res = await fetch(dataURL)
+    t.equal(await res.text(), 'node')
+  } catch (error) {
+    t.fail(`failed to fetch ${dataURL}`)
+  }
+})
diff --git a/test/fetch/encoding.js b/test/fetch/encoding.js
new file mode 100644
index 0000000..75d8fc3
--- /dev/null
+++ b/test/fetch/encoding.js
@@ -0,0 +1,58 @@
+'use strict'
+
+const { test } = require('tap')
+const { createServer } = require('http')
+const { once } = require('events')
+const { fetch } = require('../..')
+const { createBrotliCompress, createGzip, createDeflate } = require('zlib')
+
+test('content-encoding header is case-iNsENsITIve', async (t) => {
+  const contentCodings = 'GZiP, bR'
+  const text = 'Hello, World!'
+
+  const server = createServer((req, res) => {
+    const gzip = createGzip()
+    const brotli = createBrotliCompress()
+
+    res.setHeader('Content-Encoding', contentCodings)
+    res.setHeader('Content-Type', 'text/plain')
+
+    brotli.pipe(gzip).pipe(res)
+
+    brotli.write(text)
+    brotli.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const response = await fetch(`http://localhost:${server.address().port}`)
+
+  t.equal(await response.text(), text)
+  t.equal(response.headers.get('content-encoding'), contentCodings)
+})
+
+test('response decompression according to content-encoding should be handled in a correct order', async (t) => {
+  const contentCodings = 'deflate, gzip'
+  const text = 'Hello, World!'
+
+  const server = createServer((req, res) => {
+    const gzip = createGzip()
+    const deflate = createDeflate()
+
+    res.setHeader('Content-Encoding', contentCodings)
+    res.setHeader('Content-Type', 'text/plain')
+
+    gzip.pipe(deflate).pipe(res)
+
+    gzip.write(text)
+    gzip.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const response = await fetch(`http://localhost:${server.address().port}`)
+
+  t.equal(await response.text(), text)
+})
diff --git a/test/fetch/fetch-leak.js b/test/fetch/fetch-leak.js
new file mode 100644
index 0000000..b8e6b16
--- /dev/null
+++ b/test/fetch/fetch-leak.js
@@ -0,0 +1,44 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+const { createServer } = require('http')
+
+test('do not leak', (t) => {
+  t.plan(1)
+
+  const server = createServer((req, res) => {
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  let url
+  let done = false
+  server.listen(0, function attack () {
+    if (done) {
+      return
+    }
+    url ??= new URL(`http://127.0.0.1:${server.address().port}`)
+    const controller = new AbortController()
+    fetch(url, { signal: controller.signal })
+      .then(res => res.arrayBuffer())
+      .catch(() => {})
+      .then(attack)
+  })
+
+  let prev = Infinity
+  let count = 0
+  const interval = setInterval(() => {
+    done = true
+    global.gc()
+    const next = process.memoryUsage().heapUsed
+    if (next <= prev) {
+      t.pass()
+    } else if (count++ > 20) {
+      t.fail()
+    } else {
+      prev = next
+    }
+  }, 1e3)
+  t.teardown(() => clearInterval(interval))
+})
diff --git a/test/fetch/fetch-timeouts.js b/test/fetch/fetch-timeouts.js
new file mode 100644
index 0000000..b659aaa
--- /dev/null
+++ b/test/fetch/fetch-timeouts.js
@@ -0,0 +1,56 @@
+'use strict'
+
+const { test } = require('tap')
+
+const { fetch, Agent } = require('../..')
+const timers = require('../../lib/timers')
+const { createServer } = require('http')
+const FakeTimers = require('@sinonjs/fake-timers')
+
+test('Fetch very long request, timeout overridden so no error', (t) => {
+  const minutes = 6
+  const msToDelay = 1000 * 60 * minutes
+
+  t.setTimeout(undefined)
+  t.plan(1)
+
+  const clock = FakeTimers.install()
+  t.teardown(clock.uninstall.bind(clock))
+
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
+  const server = createServer((req, res) => {
+    setTimeout(() => {
+      res.end('hello')
+    }, msToDelay)
+    clock.tick(msToDelay + 1)
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, () => {
+    fetch(`http://localhost:${server.address().port}`, {
+      path: '/',
+      method: 'GET',
+      dispatcher: new Agent({
+        headersTimeout: 0,
+        connectTimeout: 0,
+        bodyTimeout: 0
+      })
+    })
+      .then((response) => response.text())
+      .then((response) => {
+        t.equal('hello', response)
+        t.end()
+      })
+      .catch((err) => {
+        // This should not happen, a timeout error should not occur
+        t.error(err)
+      })
+
+    clock.tick(msToDelay - 1)
+  })
+})
diff --git a/test/fetch/file.js b/test/fetch/file.js
new file mode 100644
index 0000000..5901541
--- /dev/null
+++ b/test/fetch/file.js
@@ -0,0 +1,190 @@
+'use strict'
+
+const { Blob } = require('buffer')
+const { test } = require('tap')
+const { File, FileLike } = require('../../lib/fetch/file')
+
+test('args validation', (t) => {
+  t.plan(14)
+
+  t.throws(() => {
+    File.prototype.name.toString()
+  }, TypeError)
+  t.throws(() => {
+    File.prototype.lastModified.toString()
+  }, TypeError)
+  t.doesNotThrow(() => {
+    File.prototype[Symbol.toStringTag].charAt(0)
+  }, TypeError)
+
+  t.throws(() => {
+    FileLike.prototype.stream.call(null)
+  }, TypeError)
+  t.throws(() => {
+    FileLike.prototype.arrayBuffer.call(null)
+  }, TypeError)
+  t.throws(() => {
+    FileLike.prototype.slice.call(null)
+  }, TypeError)
+  t.throws(() => {
+    FileLike.prototype.text.call(null)
+  }, TypeError)
+  t.throws(() => {
+    FileLike.prototype.size.toString()
+  }, TypeError)
+  t.throws(() => {
+    FileLike.prototype.type.toString()
+  }, TypeError)
+  t.throws(() => {
+    FileLike.prototype.name.toString()
+  }, TypeError)
+  t.throws(() => {
+    FileLike.prototype.lastModified.toString()
+  }, TypeError)
+  t.doesNotThrow(() => {
+    FileLike.prototype[Symbol.toStringTag].charAt(0)
+  }, TypeError)
+
+  t.equal(File.prototype[Symbol.toStringTag], 'File')
+  t.equal(FileLike.prototype[Symbol.toStringTag], 'File')
+})
+
+test('return value of File.lastModified', (t) => {
+  t.plan(2)
+
+  const f = new File(['asd1'], 'filename123')
+  const lastModified = f.lastModified
+  t.ok(typeof lastModified === typeof Date.now())
+  t.ok(lastModified >= 0 && lastModified <= Date.now())
+})
+
+test('Symbol.toStringTag', (t) => {
+  t.plan(2)
+  t.equal(new File([], '')[Symbol.toStringTag], 'File')
+  t.equal(new FileLike()[Symbol.toStringTag], 'File')
+})
+
+test('arguments', (t) => {
+  t.throws(() => {
+    new File() // eslint-disable-line no-new
+  }, TypeError)
+
+  t.throws(() => {
+    new File([]) // eslint-disable-line no-new
+  }, TypeError)
+
+  t.end()
+})
+
+test('lastModified', (t) => {
+  const file = new File([], '')
+  const lastModified = Date.now() - 69_000
+
+  t.notOk(file === 0)
+
+  const file1 = new File([], '', { lastModified })
+  t.equal(file1.lastModified, lastModified)
+
+  t.equal(new File([], '', { lastModified: 0 }).lastModified, 0)
+
+  t.equal(
+    new File([], '', {
+      lastModified: true
+    }).lastModified,
+    1
+  )
+
+  t.end()
+})
+
+test('File.prototype.text', async (t) => {
+  t.test('With Blob', async (t) => {
+    const blob1 = new Blob(['hello'])
+    const blob2 = new Blob([' '])
+    const blob3 = new Blob(['world'])
+
+    const file = new File([blob1, blob2, blob3], 'hello_world.txt')
+
+    t.equal(await file.text(), 'hello world')
+    t.end()
+  })
+
+  /* eslint-disable camelcase */
+  t.test('With TypedArray', async (t) => {
+    const uint8_1 = new Uint8Array(Buffer.from('hello'))
+    const uint8_2 = new Uint8Array(Buffer.from(' '))
+    const uint8_3 = new Uint8Array(Buffer.from('world'))
+
+    const file = new File([uint8_1, uint8_2, uint8_3], 'hello_world.txt')
+
+    t.equal(await file.text(), 'hello world')
+    t.end()
+  })
+
+  t.test('With TypedArray range', async (t) => {
+    const uint8_1 = new Uint8Array(Buffer.from('hello world'))
+    const uint8_2 = new Uint8Array(uint8_1.buffer, 1, 4)
+
+    const file = new File([uint8_2], 'hello_world.txt')
+
+    t.equal(await file.text(), 'ello')
+    t.end()
+  })
+  /* eslint-enable camelcase */
+
+  t.test('With ArrayBuffer', async (t) => {
+    const uint8 = new Uint8Array([65, 66, 67])
+    const ab = uint8.buffer
+
+    const file = new File([ab], 'file.txt')
+
+    t.equal(await file.text(), 'ABC')
+    t.end()
+  })
+
+  t.test('With string', async (t) => {
+    const string = 'hello world'
+    const file = new File([string], 'hello_world.txt')
+
+    t.equal(await file.text(), 'hello world')
+    t.end()
+  })
+
+  t.test('With Buffer', async (t) => {
+    const buffer = Buffer.from('hello world')
+
+    const file = new File([buffer], 'hello_world.txt')
+
+    t.equal(await file.text(), 'hello world')
+    t.end()
+  })
+
+  t.test('Mixed', async (t) => {
+    const blob = new Blob(['Hello, '])
+    const uint8 = new Uint8Array(Buffer.from('world! This'))
+    const string = ' is a test! Hope it passes!'
+
+    const file = new File([blob, uint8, string], 'mixed-messages.txt')
+
+    t.equal(
+      await file.text(),
+      'Hello, world! This is a test! Hope it passes!'
+    )
+    t.end()
+  })
+
+  t.end()
+})
+
+test('endings=native', async (t) => {
+  const file = new File(['Hello\nWorld'], 'text.txt', { endings: 'native' })
+  const text = await file.text()
+
+  if (process.platform === 'win32') {
+    t.equal(text, 'Hello\r\nWorld', 'on windows, LF is replace with CRLF')
+  } else {
+    t.equal(text, 'Hello\nWorld', `on ${process.platform} LF stays LF`)
+  }
+
+  t.end()
+})
diff --git a/test/fetch/formdata.js b/test/fetch/formdata.js
new file mode 100644
index 0000000..fed95bf
--- /dev/null
+++ b/test/fetch/formdata.js
@@ -0,0 +1,401 @@
+'use strict'
+
+const { test } = require('tap')
+const { FormData, File, Response } = require('../../')
+const { Blob: ThirdPartyBlob } = require('formdata-node')
+const { Blob } = require('buffer')
+const { isFormDataLike } = require('../../lib/core/util')
+const ThirdPartyFormDataInvalid = require('form-data')
+
+test('arg validation', (t) => {
+  const form = new FormData()
+
+  // constructor
+  t.throws(() => {
+    // eslint-disable-next-line
+    new FormData('asd')
+  }, TypeError)
+
+  // append
+  t.throws(() => {
+    FormData.prototype.append.call(null)
+  }, TypeError)
+  t.throws(() => {
+    form.append()
+  }, TypeError)
+  t.throws(() => {
+    form.append('k', 'not usv', '')
+  }, TypeError)
+
+  // delete
+  t.throws(() => {
+    FormData.prototype.delete.call(null)
+  }, TypeError)
+  t.throws(() => {
+    form.delete()
+  }, TypeError)
+
+  // get
+  t.throws(() => {
+    FormData.prototype.get.call(null)
+  }, TypeError)
+  t.throws(() => {
+    form.get()
+  }, TypeError)
+
+  // getAll
+  t.throws(() => {
+    FormData.prototype.getAll.call(null)
+  }, TypeError)
+  t.throws(() => {
+    form.getAll()
+  }, TypeError)
+
+  // has
+  t.throws(() => {
+    FormData.prototype.has.call(null)
+  }, TypeError)
+  t.throws(() => {
+    form.has()
+  }, TypeError)
+
+  // set
+  t.throws(() => {
+    FormData.prototype.set.call(null)
+  }, TypeError)
+  t.throws(() => {
+    form.set('k')
+  }, TypeError)
+  t.throws(() => {
+    form.set('k', 'not usv', '')
+  }, TypeError)
+
+  // iterator
+  t.throws(() => {
+    Reflect.apply(FormData.prototype[Symbol.iterator], null)
+  }, TypeError)
+
+  // toStringTag
+  t.doesNotThrow(() => {
+    FormData.prototype[Symbol.toStringTag].charAt(0)
+  })
+
+  t.end()
+})
+
+test('append file', (t) => {
+  const form = new FormData()
+  form.set('asd', new File([], 'asd1', { type: 'text/plain' }), 'asd2')
+  form.append('asd2', new File([], 'asd1'), 'asd2')
+
+  t.equal(form.has('asd'), true)
+  t.equal(form.has('asd2'), true)
+  t.equal(form.get('asd').name, 'asd2')
+  t.equal(form.get('asd2').name, 'asd2')
+  t.equal(form.get('asd').type, 'text/plain')
+  form.delete('asd')
+  t.equal(form.get('asd'), null)
+  t.equal(form.has('asd2'), true)
+  t.equal(form.has('asd'), false)
+
+  t.end()
+})
+
+test('append blob', async (t) => {
+  const form = new FormData()
+  form.set('asd', new Blob(['asd1'], { type: 'text/plain' }))
+
+  t.equal(form.has('asd'), true)
+  t.equal(form.get('asd').type, 'text/plain')
+  t.equal(await form.get('asd').text(), 'asd1')
+  form.delete('asd')
+  t.equal(form.get('asd'), null)
+
+  t.end()
+})
+
+test('append third-party blob', async (t) => {
+  const form = new FormData()
+  form.set('asd', new ThirdPartyBlob(['asd1'], { type: 'text/plain' }))
+
+  t.equal(form.has('asd'), true)
+  t.equal(form.get('asd').type, 'text/plain')
+  t.equal(await form.get('asd').text(), 'asd1')
+  form.delete('asd')
+  t.equal(form.get('asd'), null)
+
+  t.end()
+})
+
+test('append string', (t) => {
+  const form = new FormData()
+  form.set('k1', 'v1')
+  form.set('k2', 'v2')
+  t.same([...form], [['k1', 'v1'], ['k2', 'v2']])
+  t.equal(form.has('k1'), true)
+  t.equal(form.get('k1'), 'v1')
+  form.append('k1', 'v1+')
+  t.same(form.getAll('k1'), ['v1', 'v1+'])
+  form.set('k2', 'v1++')
+  t.equal(form.get('k2'), 'v1++')
+  form.delete('asd')
+  t.equal(form.get('asd'), null)
+  t.end()
+})
+
+test('formData.entries', (t) => {
+  t.plan(2)
+  const form = new FormData()
+
+  t.test('with 0 entries', (t) => {
+    t.plan(1)
+
+    const entries = [...form.entries()]
+    t.same(entries, [])
+  })
+
+  t.test('with 1+ entries', (t) => {
+    t.plan(2)
+
+    form.set('k1', 'v1')
+    form.set('k2', 'v2')
+
+    const entries = [...form.entries()]
+    const entries2 = [...form.entries()]
+    t.same(entries, [['k1', 'v1'], ['k2', 'v2']])
+    t.same(entries, entries2)
+  })
+})
+
+test('formData.keys', (t) => {
+  t.plan(2)
+  const form = new FormData()
+
+  t.test('with 0 keys', (t) => {
+    t.plan(1)
+
+    const keys = [...form.entries()]
+    t.same(keys, [])
+  })
+
+  t.test('with 1+ keys', (t) => {
+    t.plan(2)
+
+    form.set('k1', 'v1')
+    form.set('k2', 'v2')
+
+    const keys = [...form.keys()]
+    const keys2 = [...form.keys()]
+    t.same(keys, ['k1', 'k2'])
+    t.same(keys, keys2)
+  })
+})
+
+test('formData.values', (t) => {
+  t.plan(2)
+  const form = new FormData()
+
+  t.test('with 0 values', (t) => {
+    t.plan(1)
+
+    const values = [...form.values()]
+    t.same(values, [])
+  })
+
+  t.test('with 1+ values', (t) => {
+    t.plan(2)
+
+    form.set('k1', 'v1')
+    form.set('k2', 'v2')
+
+    const values = [...form.values()]
+    const values2 = [...form.values()]
+    t.same(values, ['v1', 'v2'])
+    t.same(values, values2)
+  })
+})
+
+test('formData forEach', (t) => {
+  t.test('invalid arguments', (t) => {
+    t.throws(() => {
+      FormData.prototype.forEach.call({})
+    }, TypeError('Illegal invocation'))
+
+    t.throws(() => {
+      const fd = new FormData()
+
+      fd.forEach({})
+    }, TypeError)
+
+    t.end()
+  })
+
+  t.test('with a callback', (t) => {
+    const fd = new FormData()
+
+    fd.set('a', 'b')
+    fd.set('c', 'd')
+
+    let i = 0
+    fd.forEach((value, key, self) => {
+      if (i++ === 0) {
+        t.equal(value, 'b')
+        t.equal(key, 'a')
+      } else {
+        t.equal(value, 'd')
+        t.equal(key, 'c')
+      }
+
+      t.equal(fd, self)
+    })
+
+    t.end()
+  })
+
+  t.test('with a thisArg', (t) => {
+    const fd = new FormData()
+    fd.set('b', 'a')
+
+    fd.forEach(function (value, key, self) {
+      t.equal(this, globalThis)
+      t.equal(fd, self)
+      t.equal(key, 'b')
+      t.equal(value, 'a')
+    })
+
+    const thisArg = Symbol('thisArg')
+    fd.forEach(function () {
+      t.equal(this, thisArg)
+    }, thisArg)
+
+    t.end()
+  })
+
+  t.end()
+})
+
+test('formData toStringTag', (t) => {
+  const form = new FormData()
+  t.equal(form[Symbol.toStringTag], 'FormData')
+  t.equal(FormData.prototype[Symbol.toStringTag], 'FormData')
+  t.end()
+})
+
+test('formData.constructor.name', (t) => {
+  const form = new FormData()
+  t.equal(form.constructor.name, 'FormData')
+  t.end()
+})
+
+test('formData should be an instance of FormData', (t) => {
+  t.plan(3)
+
+  t.test('Invalid class FormData', (t) => {
+    class FormData {
+      constructor () {
+        this.data = []
+      }
+
+      append (key, value) {
+        this.data.push([key, value])
+      }
+
+      get (key) {
+        return this.data.find(([k]) => k === key)
+      }
+    }
+
+    const form = new FormData()
+    t.equal(isFormDataLike(form), false)
+    t.end()
+  })
+
+  t.test('Invalid function FormData', (t) => {
+    function FormData () {
+      const data = []
+      return {
+        append (key, value) {
+          data.push([key, value])
+        },
+        get (key) {
+          return data.find(([k]) => k === key)
+        }
+      }
+    }
+
+    const form = new FormData()
+    t.equal(isFormDataLike(form), false)
+    t.end()
+  })
+
+  test('Invalid third-party FormData', (t) => {
+    const form = new ThirdPartyFormDataInvalid()
+    t.equal(isFormDataLike(form), false)
+    t.end()
+  })
+
+  t.test('Valid FormData', (t) => {
+    const form = new FormData()
+    t.equal(isFormDataLike(form), true)
+    t.end()
+  })
+})
+
+test('FormData should be compatible with third-party libraries', (t) => {
+  t.plan(1)
+
+  class FormData {
+    constructor () {
+      this.data = []
+    }
+
+    get [Symbol.toStringTag] () {
+      return 'FormData'
+    }
+
+    append () {}
+    delete () {}
+    get () {}
+    getAll () {}
+    has () {}
+    set () {}
+    entries () {}
+    keys () {}
+    values () {}
+    forEach () {}
+  }
+
+  const form = new FormData()
+  t.equal(isFormDataLike(form), true)
+})
+
+test('arguments', (t) => {
+  t.equal(FormData.constructor.length, 1)
+  t.equal(FormData.prototype.append.length, 2)
+  t.equal(FormData.prototype.delete.length, 1)
+  t.equal(FormData.prototype.get.length, 1)
+  t.equal(FormData.prototype.getAll.length, 1)
+  t.equal(FormData.prototype.has.length, 1)
+  t.equal(FormData.prototype.set.length, 2)
+
+  t.end()
+})
+
+// https://github.com/nodejs/undici/pull/1814
+test('FormData returned from bodyMixin.formData is not a clone', async (t) => {
+  const fd = new FormData()
+  fd.set('foo', 'bar')
+
+  const res = new Response(fd)
+  fd.set('foo', 'foo')
+
+  const fd2 = await res.formData()
+
+  t.equal(fd2.get('foo'), 'bar')
+  t.equal(fd.get('foo'), 'foo')
+
+  fd2.set('foo', 'baz')
+
+  t.equal(fd2.get('foo'), 'baz')
+  t.equal(fd.get('foo'), 'foo')
+})
diff --git a/test/fetch/general.js b/test/fetch/general.js
new file mode 100644
index 0000000..0469875
--- /dev/null
+++ b/test/fetch/general.js
@@ -0,0 +1,30 @@
+'use strict'
+
+const { test } = require('tap')
+const {
+  File,
+  FormData,
+  Headers,
+  Request,
+  Response
+} = require('../../index')
+
+test('Symbol.toStringTag descriptor', (t) => {
+  for (const cls of [
+    File,
+    FormData,
+    Headers,
+    Request,
+    Response
+  ]) {
+    const desc = Object.getOwnPropertyDescriptor(cls.prototype, Symbol.toStringTag)
+    t.same(desc, {
+      value: cls.name,
+      writable: false,
+      enumerable: false,
+      configurable: true
+    })
+  }
+
+  t.end()
+})
diff --git a/test/fetch/headers.js b/test/fetch/headers.js
new file mode 100644
index 0000000..4846110
--- /dev/null
+++ b/test/fetch/headers.js
@@ -0,0 +1,743 @@
+'use strict'
+
+const tap = require('tap')
+const { Headers, fill } = require('../../lib/fetch/headers')
+const { kGuard } = require('../../lib/fetch/symbols')
+const { once } = require('events')
+const { fetch } = require('../..')
+const { createServer } = require('http')
+
+tap.test('Headers initialization', t => {
+  t.plan(8)
+
+  t.test('allows undefined', t => {
+    t.plan(1)
+
+    t.doesNotThrow(() => new Headers())
+  })
+
+  t.test('with array of header entries', t => {
+    t.plan(3)
+
+    t.test('fails on invalid array-based init', t => {
+      t.plan(3)
+      t.throws(
+        () => new Headers([['undici', 'fetch'], ['fetch']]),
+        TypeError('Headers constructor: expected name/value pair to be length 2, found 1.')
+      )
+      t.throws(() => new Headers(['undici', 'fetch', 'fetch']), TypeError)
+      t.throws(
+        () => new Headers([0, 1, 2]),
+        TypeError('Sequence: Value of type Number is not an Object.')
+      )
+    })
+
+    t.test('allows even length init', t => {
+      t.plan(1)
+      const init = [['undici', 'fetch'], ['fetch', 'undici']]
+      t.doesNotThrow(() => new Headers(init))
+    })
+
+    t.test('fails for event flattened init', t => {
+      t.plan(1)
+      const init = ['undici', 'fetch', 'fetch', 'undici']
+      t.throws(
+        () => new Headers(init),
+        TypeError('Sequence: Value of type String is not an Object.')
+      )
+    })
+  })
+
+  t.test('with object of header entries', t => {
+    t.plan(1)
+    const init = {
+      undici: 'fetch',
+      fetch: 'undici'
+    }
+    t.doesNotThrow(() => new Headers(init))
+  })
+
+  t.test('fails silently if a boxed primitive object is passed', t => {
+    t.plan(3)
+    /* eslint-disable no-new-wrappers */
+    t.doesNotThrow(() => new Headers(new Number()))
+    t.doesNotThrow(() => new Headers(new Boolean()))
+    t.doesNotThrow(() => new Headers(new String()))
+    /* eslint-enable no-new-wrappers */
+  })
+
+  t.test('fails if primitive is passed', t => {
+    t.plan(2)
+    const expectedTypeError = TypeError
+    t.throws(() => new Headers(1), expectedTypeError)
+    t.throws(() => new Headers('1'), expectedTypeError)
+  })
+
+  t.test('allows some weird stuff (because of webidl)', t => {
+    t.doesNotThrow(() => {
+      new Headers(function () {}) // eslint-disable-line no-new
+    })
+
+    t.doesNotThrow(() => {
+      new Headers(Function) // eslint-disable-line no-new
+    })
+
+    t.end()
+  })
+
+  t.test('allows a myriad of header values to be passed', t => {
+    t.plan(4)
+
+    // Headers constructor uses Headers.append
+
+    t.doesNotThrow(() => new Headers([
+      ['a', ['b', 'c']],
+      ['d', ['e', 'f']]
+    ]), 'allows any array values')
+    t.doesNotThrow(() => new Headers([
+      ['key', null]
+    ]), 'allows null values')
+    t.throws(() => new Headers([
+      ['key']
+    ]), 'throws when 2 arguments are not passed')
+    t.throws(() => new Headers([
+      ['key', 'value', 'value2']
+    ]), 'throws when too many arguments are passed')
+  })
+
+  t.test('accepts headers as objects with array values', t => {
+    t.plan(1)
+    const headers = new Headers({
+      c: '5',
+      b: ['3', '4'],
+      a: ['1', '2']
+    })
+
+    t.same([...headers.entries()], [
+      ['a', '1,2'],
+      ['b', '3,4'],
+      ['c', '5']
+    ])
+  })
+})
+
+tap.test('Headers append', t => {
+  t.plan(3)
+
+  t.test('adds valid header entry to instance', t => {
+    t.plan(2)
+    const headers = new Headers()
+
+    const name = 'undici'
+    const value = 'fetch'
+    t.doesNotThrow(() => headers.append(name, value))
+    t.equal(headers.get(name), value)
+  })
+
+  t.test('adds valid header to existing entry', t => {
+    t.plan(4)
+    const headers = new Headers()
+
+    const name = 'undici'
+    const value1 = 'fetch1'
+    const value2 = 'fetch2'
+    const value3 = 'fetch3'
+    headers.append(name, value1)
+    t.equal(headers.get(name), value1)
+    t.doesNotThrow(() => headers.append(name, value2))
+    t.doesNotThrow(() => headers.append(name, value3))
+    t.equal(headers.get(name), [value1, value2, value3].join(', '))
+  })
+
+  t.test('throws on invalid entry', t => {
+    t.plan(3)
+    const headers = new Headers()
+
+    t.throws(() => headers.append(), 'throws on missing name and value')
+    t.throws(() => headers.append('undici'), 'throws on missing value')
+    t.throws(() => headers.append('invalid @ header ? name', 'valid value'), 'throws on invalid name')
+  })
+})
+
+tap.test('Headers delete', t => {
+  t.plan(4)
+
+  t.test('deletes valid header entry from instance', t => {
+    t.plan(3)
+    const headers = new Headers()
+
+    const name = 'undici'
+    const value = 'fetch'
+    headers.append(name, value)
+    t.equal(headers.get(name), value)
+    t.doesNotThrow(() => headers.delete(name))
+    t.equal(headers.get(name), null)
+  })
+
+  t.test('does not mutate internal list when no match is found', t => {
+    t.plan(3)
+
+    const headers = new Headers()
+    const name = 'undici'
+    const value = 'fetch'
+    headers.append(name, value)
+    t.equal(headers.get(name), value)
+    t.doesNotThrow(() => headers.delete('not-undici'))
+    t.equal(headers.get(name), value)
+  })
+
+  t.test('throws on invalid entry', t => {
+    t.plan(2)
+    const headers = new Headers()
+
+    t.throws(() => headers.delete(), 'throws on missing namee')
+    t.throws(() => headers.delete('invalid @ header ? name'), 'throws on invalid name')
+  })
+
+  // https://github.com/nodejs/undici/issues/2429
+  t.test('`Headers#delete` returns undefined', t => {
+    t.plan(2)
+    const headers = new Headers({ test: 'test' })
+
+    t.same(headers.delete('test'), undefined)
+    t.same(headers.delete('test2'), undefined)
+  })
+})
+
+tap.test('Headers get', t => {
+  t.plan(3)
+
+  t.test('returns null if not found in instance', t => {
+    t.plan(1)
+    const headers = new Headers()
+    headers.append('undici', 'fetch')
+
+    t.equal(headers.get('not-undici'), null)
+  })
+
+  t.test('returns header values from valid header name', t => {
+    t.plan(2)
+    const headers = new Headers()
+
+    const name = 'undici'; const value1 = 'fetch1'; const value2 = 'fetch2'
+    headers.append(name, value1)
+    t.equal(headers.get(name), value1)
+    headers.append(name, value2)
+    t.equal(headers.get(name), [value1, value2].join(', '))
+  })
+
+  t.test('throws on invalid entry', t => {
+    t.plan(2)
+    const headers = new Headers()
+
+    t.throws(() => headers.get(), 'throws on missing name')
+    t.throws(() => headers.get('invalid @ header ? name'), 'throws on invalid name')
+  })
+})
+
+tap.test('Headers has', t => {
+  t.plan(2)
+
+  t.test('returns boolean existence for a header name', t => {
+    t.plan(2)
+    const headers = new Headers()
+
+    const name = 'undici'
+    headers.append('not-undici', 'fetch')
+    t.equal(headers.has(name), false)
+    headers.append(name, 'fetch')
+    t.equal(headers.has(name), true)
+  })
+
+  t.test('throws on invalid entry', t => {
+    t.plan(2)
+    const headers = new Headers()
+
+    t.throws(() => headers.has(), 'throws on missing name')
+    t.throws(() => headers.has('invalid @ header ? name'), 'throws on invalid name')
+  })
+})
+
+tap.test('Headers set', t => {
+  t.plan(5)
+
+  t.test('sets valid header entry to instance', t => {
+    t.plan(2)
+    const headers = new Headers()
+
+    const name = 'undici'
+    const value = 'fetch'
+    headers.append('not-undici', 'fetch')
+    t.doesNotThrow(() => headers.set(name, value))
+    t.equal(headers.get(name), value)
+  })
+
+  t.test('overwrites existing entry', t => {
+    t.plan(4)
+    const headers = new Headers()
+
+    const name = 'undici'
+    const value1 = 'fetch1'
+    const value2 = 'fetch2'
+    t.doesNotThrow(() => headers.set(name, value1))
+    t.equal(headers.get(name), value1)
+    t.doesNotThrow(() => headers.set(name, value2))
+    t.equal(headers.get(name), value2)
+  })
+
+  t.test('allows setting a myriad of values', t => {
+    t.plan(4)
+    const headers = new Headers()
+
+    t.doesNotThrow(() => headers.set('a', ['b', 'c']), 'sets array values properly')
+    t.doesNotThrow(() => headers.set('b', null), 'allows setting null values')
+    t.throws(() => headers.set('c'), 'throws when 2 arguments are not passed')
+    t.doesNotThrow(() => headers.set('c', 'd', 'e'), 'ignores extra arguments')
+  })
+
+  t.test('throws on invalid entry', t => {
+    t.plan(3)
+    const headers = new Headers()
+
+    t.throws(() => headers.set(), 'throws on missing name and value')
+    t.throws(() => headers.set('undici'), 'throws on missing value')
+    t.throws(() => headers.set('invalid @ header ? name', 'valid value'), 'throws on invalid name')
+  })
+
+  // https://github.com/nodejs/undici/issues/2431
+  t.test('`Headers#set` returns undefined', t => {
+    t.plan(2)
+    const headers = new Headers()
+
+    t.same(headers.set('a', 'b'), undefined)
+
+    t.notOk(headers.set('c', 'd') instanceof Map)
+  })
+})
+
+tap.test('Headers forEach', t => {
+  const headers = new Headers([['a', 'b'], ['c', 'd']])
+
+  t.test('standard', t => {
+    t.equal(typeof headers.forEach, 'function')
+
+    headers.forEach((value, key, headerInstance) => {
+      t.ok(value === 'b' || value === 'd')
+      t.ok(key === 'a' || key === 'c')
+      t.equal(headers, headerInstance)
+    })
+
+    t.end()
+  })
+
+  t.test('when no thisArg is set, it is globalThis', (t) => {
+    headers.forEach(function () {
+      t.equal(this, globalThis)
+    })
+
+    t.end()
+  })
+
+  t.test('with thisArg', t => {
+    const thisArg = { a: Math.random() }
+    headers.forEach(function () {
+      t.equal(this, thisArg)
+    }, thisArg)
+
+    t.end()
+  })
+
+  t.end()
+})
+
+tap.test('Headers as Iterable', t => {
+  t.plan(7)
+
+  t.test('should freeze values while iterating', t => {
+    t.plan(1)
+    const init = [
+      ['foo', '123'],
+      ['bar', '456']
+    ]
+    const expected = [
+      ['foo', '123'],
+      ['x-x-bar', '456']
+    ]
+    const headers = new Headers(init)
+    for (const [key, val] of headers) {
+      headers.delete(key)
+      headers.set(`x-${key}`, val)
+    }
+    t.strictSame([...headers], expected)
+  })
+
+  t.test('returns combined and sorted entries using .forEach()', t => {
+    t.plan(8)
+    const init = [
+      ['a', '1'],
+      ['b', '2'],
+      ['c', '3'],
+      ['abc', '4'],
+      ['b', '5']
+    ]
+    const expected = [
+      ['a', '1'],
+      ['abc', '4'],
+      ['b', '2, 5'],
+      ['c', '3']
+    ]
+    const headers = new Headers(init)
+    const that = {}
+    let i = 0
+    headers.forEach(function (value, key, _headers) {
+      t.strictSame(expected[i++], [key, value])
+      t.equal(this, that)
+    }, that)
+  })
+
+  t.test('returns combined and sorted entries using .entries()', t => {
+    t.plan(4)
+    const init = [
+      ['a', '1'],
+      ['b', '2'],
+      ['c', '3'],
+      ['abc', '4'],
+      ['b', '5']
+    ]
+    const expected = [
+      ['a', '1'],
+      ['abc', '4'],
+      ['b', '2, 5'],
+      ['c', '3']
+    ]
+    const headers = new Headers(init)
+    let i = 0
+    for (const header of headers.entries()) {
+      t.strictSame(header, expected[i++])
+    }
+  })
+
+  t.test('returns combined and sorted keys using .keys()', t => {
+    t.plan(4)
+    const init = [
+      ['a', '1'],
+      ['b', '2'],
+      ['c', '3'],
+      ['abc', '4'],
+      ['b', '5']
+    ]
+    const expected = ['a', 'abc', 'b', 'c']
+    const headers = new Headers(init)
+    let i = 0
+    for (const key of headers.keys()) {
+      t.strictSame(key, expected[i++])
+    }
+  })
+
+  t.test('returns combined and sorted values using .values()', t => {
+    t.plan(4)
+    const init = [
+      ['a', '1'],
+      ['b', '2'],
+      ['c', '3'],
+      ['abc', '4'],
+      ['b', '5']
+    ]
+    const expected = ['1', '4', '2, 5', '3']
+    const headers = new Headers(init)
+    let i = 0
+    for (const value of headers.values()) {
+      t.strictSame(value, expected[i++])
+    }
+  })
+
+  t.test('returns combined and sorted entries using for...of loop', t => {
+    t.plan(5)
+    const init = [
+      ['a', '1'],
+      ['b', '2'],
+      ['c', '3'],
+      ['abc', '4'],
+      ['b', '5'],
+      ['d', ['6', '7']]
+    ]
+    const expected = [
+      ['a', '1'],
+      ['abc', '4'],
+      ['b', '2, 5'],
+      ['c', '3'],
+      ['d', '6,7']
+    ]
+    let i = 0
+    for (const header of new Headers(init)) {
+      t.strictSame(header, expected[i++])
+    }
+  })
+
+  t.test('validate append ordering', t => {
+    t.plan(1)
+    const headers = new Headers([['b', '2'], ['c', '3'], ['e', '5']])
+    headers.append('d', '4')
+    headers.append('a', '1')
+    headers.append('f', '6')
+    headers.append('c', '7')
+    headers.append('abc', '8')
+
+    const expected = [...new Map([
+      ['a', '1'],
+      ['abc', '8'],
+      ['b', '2'],
+      ['c', '3, 7'],
+      ['d', '4'],
+      ['e', '5'],
+      ['f', '6']
+    ])]
+
+    t.same([...headers], expected)
+  })
+})
+
+tap.test('arg validation', (t) => {
+  // fill
+  t.throws(() => {
+    fill({}, 0)
+  }, TypeError)
+
+  const headers = new Headers()
+
+  // constructor
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Headers(0)
+  }, TypeError)
+
+  // get [Symbol.toStringTag]
+  t.doesNotThrow(() => {
+    Object.prototype.toString.call(Headers.prototype)
+  })
+
+  // toString
+  t.doesNotThrow(() => {
+    Headers.prototype.toString.call(null)
+  })
+
+  // append
+  t.throws(() => {
+    Headers.prototype.append.call(null)
+  }, TypeError)
+  t.throws(() => {
+    headers.append()
+  }, TypeError)
+
+  // delete
+  t.throws(() => {
+    Headers.prototype.delete.call(null)
+  }, TypeError)
+  t.throws(() => {
+    headers.delete()
+  }, TypeError)
+
+  // get
+  t.throws(() => {
+    Headers.prototype.get.call(null)
+  }, TypeError)
+  t.throws(() => {
+    headers.get()
+  }, TypeError)
+
+  // has
+  t.throws(() => {
+    Headers.prototype.has.call(null)
+  }, TypeError)
+  t.throws(() => {
+    headers.has()
+  }, TypeError)
+
+  // set
+  t.throws(() => {
+    Headers.prototype.set.call(null)
+  }, TypeError)
+  t.throws(() => {
+    headers.set()
+  }, TypeError)
+
+  // forEach
+  t.throws(() => {
+    Headers.prototype.forEach.call(null)
+  }, TypeError)
+  t.throws(() => {
+    headers.forEach()
+  }, TypeError)
+  t.throws(() => {
+    headers.forEach(1)
+  }, TypeError)
+
+  // inspect
+  t.throws(() => {
+    Headers.prototype[Symbol.for('nodejs.util.inspect.custom')].call(null)
+  }, TypeError)
+
+  t.end()
+})
+
+tap.test('function signature verification', (t) => {
+  t.test('function length', (t) => {
+    t.equal(Headers.prototype.append.length, 2)
+    t.equal(Headers.prototype.constructor.length, 0)
+    t.equal(Headers.prototype.delete.length, 1)
+    t.equal(Headers.prototype.entries.length, 0)
+    t.equal(Headers.prototype.forEach.length, 1)
+    t.equal(Headers.prototype.get.length, 1)
+    t.equal(Headers.prototype.has.length, 1)
+    t.equal(Headers.prototype.keys.length, 0)
+    t.equal(Headers.prototype.set.length, 2)
+    t.equal(Headers.prototype.values.length, 0)
+    t.equal(Headers.prototype[Symbol.iterator].length, 0)
+    t.equal(Headers.prototype.toString.length, 0)
+
+    t.end()
+  })
+
+  t.test('function equality', (t) => {
+    t.equal(Headers.prototype.entries, Headers.prototype[Symbol.iterator])
+    t.equal(Headers.prototype.toString, Object.prototype.toString)
+
+    t.end()
+  })
+
+  t.test('toString and Symbol.toStringTag', (t) => {
+    t.equal(Object.prototype.toString.call(Headers.prototype), '[object Headers]')
+    t.equal(Headers.prototype[Symbol.toStringTag], 'Headers')
+    t.equal(Headers.prototype.toString.call(null), '[object Null]')
+
+    t.end()
+  })
+
+  t.end()
+})
+
+tap.test('various init paths of Headers', (t) => {
+  const h1 = new Headers()
+  const h2 = new Headers({})
+  const h3 = new Headers(undefined)
+  t.equal([...h1.entries()].length, 0)
+  t.equal([...h2.entries()].length, 0)
+  t.equal([...h3.entries()].length, 0)
+
+  t.end()
+})
+
+tap.test('immutable guard', (t) => {
+  const headers = new Headers()
+  headers.set('key', 'val')
+  headers[kGuard] = 'immutable'
+
+  t.throws(() => {
+    headers.set('asd', 'asd')
+  })
+  t.throws(() => {
+    headers.append('asd', 'asd')
+  })
+  t.throws(() => {
+    headers.delete('asd')
+  })
+  t.equal(headers.get('key'), 'val')
+  t.equal(headers.has('key'), true)
+
+  t.end()
+})
+
+tap.test('request-no-cors guard', (t) => {
+  const headers = new Headers()
+  headers[kGuard] = 'request-no-cors'
+  t.doesNotThrow(() => { headers.set('key', 'val') })
+  t.doesNotThrow(() => { headers.append('key', 'val') })
+  t.doesNotThrow(() => { headers.delete('key') })
+  t.end()
+})
+
+tap.test('invalid headers', (t) => {
+  t.doesNotThrow(() => new Headers({ "abcdefghijklmnopqrstuvwxyz0123456789!#$%&'*+-.^_`|~": 'test' }))
+
+  const chars = '"(),/:;<=>?@[\\]{}'.split('')
+
+  for (const char of chars) {
+    t.throws(() => new Headers({ [char]: 'test' }), TypeError, `The string "${char}" should throw an error.`)
+  }
+
+  for (const byte of ['\r', '\n', '\t', ' ', String.fromCharCode(128), '']) {
+    t.throws(() => {
+      new Headers().set(byte, 'test')
+    }, TypeError, 'invalid header name')
+  }
+
+  for (const byte of [
+    '\0',
+    '\r',
+    '\n'
+  ]) {
+    t.throws(() => {
+      new Headers().set('a', `a${byte}b`)
+    }, TypeError, 'not allowed at all in header value')
+  }
+
+  t.doesNotThrow(() => {
+    new Headers().set('a', '\r')
+  })
+
+  t.doesNotThrow(() => {
+    new Headers().set('a', '\n')
+  })
+
+  t.throws(() => {
+    new Headers().set('a', Symbol('symbol'))
+  }, TypeError, 'symbols should throw')
+
+  t.end()
+})
+
+tap.test('headers that might cause a ReDoS', (t) => {
+  t.doesNotThrow(() => {
+    // This test will time out if the ReDoS attack is successful.
+    const headers = new Headers()
+    const attack = 'a' + '\t'.repeat(500_000) + '\ta'
+    headers.append('fhqwhgads', attack)
+  })
+
+  t.end()
+})
+
+tap.test('Headers.prototype.getSetCookie', (t) => {
+  t.test('Mutating the returned list does not affect the set-cookie list', (t) => {
+    const h = new Headers([
+      ['set-cookie', 'a=b'],
+      ['set-cookie', 'c=d']
+    ])
+
+    const old = h.getSetCookie()
+    h.getSetCookie().push('oh=no')
+    const now = h.getSetCookie()
+
+    t.same(old, now)
+    t.end()
+  })
+
+  // https://github.com/nodejs/undici/issues/1935
+  t.test('When Headers are cloned, so are the cookies', async (t) => {
+    const server = createServer((req, res) => {
+      res.setHeader('Set-Cookie', 'test=onetwo')
+      res.end('Hello World!')
+    }).listen(0)
+
+    await once(server, 'listening')
+    t.teardown(server.close.bind(server))
+
+    const res = await fetch(`http://localhost:${server.address().port}`)
+    const entries = Object.fromEntries(res.headers.entries())
+
+    t.same(res.headers.getSetCookie(), ['test=onetwo'])
+    t.ok('set-cookie' in entries)
+  })
+
+  t.end()
+})
diff --git a/test/fetch/http2.js b/test/fetch/http2.js
new file mode 100644
index 0000000..9f6997f
--- /dev/null
+++ b/test/fetch/http2.js
@@ -0,0 +1,415 @@
+'use strict'
+
+const { createSecureServer } = require('node:http2')
+const { createReadStream, readFileSync } = require('node:fs')
+const { once } = require('node:events')
+const { Blob } = require('node:buffer')
+const { Readable } = require('node:stream')
+
+const { test, plan } = require('tap')
+const pem = require('https-pem')
+
+const { Client, fetch, Headers } = require('../..')
+
+const nodeVersion = Number(process.version.split('v')[1].split('.')[0])
+
+plan(7)
+
+test('[Fetch] Issue#2311', async t => {
+  const expectedBody = 'hello from client!'
+
+  const server = createSecureServer(pem, async (req, res) => {
+    let body = ''
+
+    req.setEncoding('utf8')
+
+    res.writeHead(200, {
+      'content-type': 'text/plain; charset=utf-8',
+      'x-custom-h2': req.headers['x-my-header']
+    })
+
+    for await (const chunk of req) {
+      body += chunk
+    }
+
+    res.end(body)
+  })
+
+  t.plan(1)
+
+  server.listen()
+  await once(server, 'listening')
+
+  const client = new Client(`https://localhost:${server.address().port}`, {
+    connect: {
+      rejectUnauthorized: false
+    },
+    allowH2: true
+  })
+
+  const response = await fetch(
+    `https://localhost:${server.address().port}/`,
+    // Needs to be passed to disable the reject unauthorized
+    {
+      method: 'POST',
+      dispatcher: client,
+      headers: {
+        'x-my-header': 'foo',
+        'content-type': 'text-plain'
+      },
+      body: expectedBody
+    }
+  )
+
+  const responseBody = await response.text()
+
+  t.teardown(server.close.bind(server))
+  t.teardown(client.close.bind(client))
+
+  t.equal(responseBody, expectedBody)
+})
+
+test('[Fetch] Simple GET with h2', async t => {
+  const server = createSecureServer(pem)
+  const expectedRequestBody = 'hello h2!'
+
+  server.on('stream', async (stream, headers) => {
+    stream.respond({
+      'content-type': 'text/plain; charset=utf-8',
+      'x-custom-h2': headers['x-my-header'],
+      'x-method': headers[':method'],
+      ':status': 200
+    })
+
+    stream.end(expectedRequestBody)
+  })
+
+  t.plan(5)
+
+  server.listen()
+  await once(server, 'listening')
+
+  const client = new Client(`https://localhost:${server.address().port}`, {
+    connect: {
+      rejectUnauthorized: false
+    },
+    allowH2: true
+  })
+
+  const response = await fetch(
+    `https://localhost:${server.address().port}/`,
+    // Needs to be passed to disable the reject unauthorized
+    {
+      method: 'GET',
+      dispatcher: client,
+      headers: {
+        'x-my-header': 'foo',
+        'content-type': 'text-plain'
+      }
+    }
+  )
+
+  const responseBody = await response.text()
+
+  t.teardown(server.close.bind(server))
+  t.teardown(client.close.bind(client))
+
+  t.equal(responseBody, expectedRequestBody)
+  t.equal(response.headers.get('x-method'), 'GET')
+  t.equal(response.headers.get('x-custom-h2'), 'foo')
+  // https://github.com/nodejs/undici/issues/2415
+  t.throws(() => {
+    response.headers.get(':status')
+  }, TypeError)
+
+  // See https://fetch.spec.whatwg.org/#concept-response-status-message
+  t.equal(response.statusText, '')
+})
+
+test('[Fetch] Should handle h2 request with body (string or buffer)', async t => {
+  const server = createSecureServer(pem)
+  const expectedBody = 'hello from client!'
+  const expectedRequestBody = 'hello h2!'
+  const requestBody = []
+
+  server.on('stream', async (stream, headers) => {
+    stream.on('data', chunk => requestBody.push(chunk))
+
+    stream.respond({
+      'content-type': 'text/plain; charset=utf-8',
+      'x-custom-h2': headers['x-my-header'],
+      ':status': 200
+    })
+
+    stream.end(expectedRequestBody)
+  })
+
+  t.plan(2)
+
+  server.listen()
+  await once(server, 'listening')
+
+  const client = new Client(`https://localhost:${server.address().port}`, {
+    connect: {
+      rejectUnauthorized: false
+    },
+    allowH2: true
+  })
+
+  const response = await fetch(
+    `https://localhost:${server.address().port}/`,
+    // Needs to be passed to disable the reject unauthorized
+    {
+      method: 'POST',
+      dispatcher: client,
+      headers: {
+        'x-my-header': 'foo',
+        'content-type': 'text-plain'
+      },
+      body: expectedBody
+    }
+  )
+
+  const responseBody = await response.text()
+
+  t.teardown(server.close.bind(server))
+  t.teardown(client.close.bind(client))
+
+  t.equal(Buffer.concat(requestBody).toString('utf-8'), expectedBody)
+  t.equal(responseBody, expectedRequestBody)
+})
+
+// Skipping for now, there is something odd in the way the body is handled
+test(
+  '[Fetch] Should handle h2 request with body (stream)',
+  { skip: nodeVersion === 16 },
+  async t => {
+    const server = createSecureServer(pem)
+    const expectedBody = readFileSync(__filename, 'utf-8')
+    const stream = createReadStream(__filename)
+    const requestChunks = []
+
+    server.on('stream', async (stream, headers) => {
+      t.equal(headers[':method'], 'PUT')
+      t.equal(headers[':path'], '/')
+      t.equal(headers[':scheme'], 'https')
+
+      stream.respond({
+        'content-type': 'text/plain; charset=utf-8',
+        'x-custom-h2': headers['x-my-header'],
+        ':status': 200
+      })
+
+      for await (const chunk of stream) {
+        requestChunks.push(chunk)
+      }
+
+      stream.end('hello h2!')
+    })
+
+    t.plan(8)
+
+    server.listen(0)
+    await once(server, 'listening')
+
+    const client = new Client(`https://localhost:${server.address().port}`, {
+      connect: {
+        rejectUnauthorized: false
+      },
+      allowH2: true
+    })
+
+    t.teardown(server.close.bind(server))
+    t.teardown(client.close.bind(client))
+
+    const response = await fetch(
+      `https://localhost:${server.address().port}/`,
+      // Needs to be passed to disable the reject unauthorized
+      {
+        method: 'PUT',
+        dispatcher: client,
+        headers: {
+          'x-my-header': 'foo',
+          'content-type': 'text-plain'
+        },
+        body: Readable.toWeb(stream),
+        duplex: 'half'
+      }
+    )
+
+    const responseBody = await response.text()
+
+    t.equal(response.status, 200)
+    t.equal(response.headers.get('content-type'), 'text/plain; charset=utf-8')
+    t.equal(response.headers.get('x-custom-h2'), 'foo')
+    t.equal(responseBody, 'hello h2!')
+    t.equal(Buffer.concat(requestChunks).toString('utf-8'), expectedBody)
+  }
+)
+test('Should handle h2 request with body (Blob)', { skip: !Blob }, async t => {
+  const server = createSecureServer(pem)
+  const expectedBody = 'asd'
+  const requestChunks = []
+  const body = new Blob(['asd'], {
+    type: 'text/plain'
+  })
+
+  server.on('stream', async (stream, headers) => {
+    t.equal(headers[':method'], 'POST')
+    t.equal(headers[':path'], '/')
+    t.equal(headers[':scheme'], 'https')
+
+    stream.on('data', chunk => requestChunks.push(chunk))
+
+    stream.respond({
+      'content-type': 'text/plain; charset=utf-8',
+      'x-custom-h2': headers['x-my-header'],
+      ':status': 200
+    })
+
+    stream.end('hello h2!')
+  })
+
+  t.plan(8)
+
+  server.listen(0)
+  await once(server, 'listening')
+
+  const client = new Client(`https://localhost:${server.address().port}`, {
+    connect: {
+      rejectUnauthorized: false
+    },
+    allowH2: true
+  })
+
+  t.teardown(server.close.bind(server))
+  t.teardown(client.close.bind(client))
+
+  const response = await fetch(
+    `https://localhost:${server.address().port}/`,
+    // Needs to be passed to disable the reject unauthorized
+    {
+      body,
+      method: 'POST',
+      dispatcher: client,
+      headers: {
+        'x-my-header': 'foo',
+        'content-type': 'text-plain'
+      }
+    }
+  )
+
+  const responseBody = await response.arrayBuffer()
+
+  t.equal(response.status, 200)
+  t.equal(response.headers.get('content-type'), 'text/plain; charset=utf-8')
+  t.equal(response.headers.get('x-custom-h2'), 'foo')
+  t.same(new TextDecoder().decode(responseBody).toString(), 'hello h2!')
+  t.equal(Buffer.concat(requestChunks).toString('utf-8'), expectedBody)
+})
+
+test(
+  'Should handle h2 request with body (Blob:ArrayBuffer)',
+  { skip: !Blob },
+  async t => {
+    const server = createSecureServer(pem)
+    const expectedBody = 'hello'
+    const requestChunks = []
+    const expectedResponseBody = { hello: 'h2' }
+    const buf = Buffer.from(expectedBody)
+    const body = new ArrayBuffer(buf.byteLength)
+
+    buf.copy(new Uint8Array(body))
+
+    server.on('stream', async (stream, headers) => {
+      t.equal(headers[':method'], 'PUT')
+      t.equal(headers[':path'], '/')
+      t.equal(headers[':scheme'], 'https')
+
+      stream.on('data', chunk => requestChunks.push(chunk))
+
+      stream.respond({
+        'content-type': 'application/json',
+        'x-custom-h2': headers['x-my-header'],
+        ':status': 200
+      })
+
+      stream.end(JSON.stringify(expectedResponseBody))
+    })
+
+    t.plan(8)
+
+    server.listen(0)
+    await once(server, 'listening')
+
+    const client = new Client(`https://localhost:${server.address().port}`, {
+      connect: {
+        rejectUnauthorized: false
+      },
+      allowH2: true
+    })
+
+    t.teardown(server.close.bind(server))
+    t.teardown(client.close.bind(client))
+
+    const response = await fetch(
+      `https://localhost:${server.address().port}/`,
+      // Needs to be passed to disable the reject unauthorized
+      {
+        body,
+        method: 'PUT',
+        dispatcher: client,
+        headers: {
+          'x-my-header': 'foo',
+          'content-type': 'text-plain'
+        }
+      }
+    )
+
+    const responseBody = await response.json()
+
+    t.equal(response.status, 200)
+    t.equal(response.headers.get('content-type'), 'application/json')
+    t.equal(response.headers.get('x-custom-h2'), 'foo')
+    t.same(responseBody, expectedResponseBody)
+    t.equal(Buffer.concat(requestChunks).toString('utf-8'), expectedBody)
+  }
+)
+
+test('Issue#2415', async (t) => {
+  t.plan(1)
+  const server = createSecureServer(pem)
+
+  server.on('stream', async (stream, headers) => {
+    stream.respond({
+      ':status': 200
+    })
+    stream.end('test')
+  })
+
+  server.listen()
+  await once(server, 'listening')
+
+  const client = new Client(`https://localhost:${server.address().port}`, {
+    connect: {
+      rejectUnauthorized: false
+    },
+    allowH2: true
+  })
+
+  const response = await fetch(
+    `https://localhost:${server.address().port}/`,
+    // Needs to be passed to disable the reject unauthorized
+    {
+      method: 'GET',
+      dispatcher: client
+    }
+  )
+
+  await response.text()
+
+  t.teardown(server.close.bind(server))
+  t.teardown(client.close.bind(client))
+
+  t.doesNotThrow(() => new Headers(response.headers))
+})
diff --git a/test/fetch/integrity.js b/test/fetch/integrity.js
new file mode 100644
index 0000000..f91f693
--- /dev/null
+++ b/test/fetch/integrity.js
@@ -0,0 +1,150 @@
+'use strict'
+
+const { test } = require('tap')
+const { createServer } = require('http')
+const { createHash, getHashes } = require('crypto')
+const { gzipSync } = require('zlib')
+const { fetch, setGlobalDispatcher, Agent } = require('../..')
+const { once } = require('events')
+
+const supportedHashes = getHashes()
+
+setGlobalDispatcher(new Agent({
+  keepAliveTimeout: 1,
+  keepAliveMaxTimeout: 1
+}))
+
+test('request with correct integrity checksum', (t) => {
+  const body = 'Hello world!'
+  const hash = createHash('sha256').update(body).digest('base64')
+
+  const server = createServer((req, res) => {
+    res.end(body)
+  })
+
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const response = await fetch(`http://localhost:${server.address().port}`, {
+      integrity: `sha256-${hash}`
+    })
+    t.strictSame(body, await response.text())
+    t.end()
+  })
+})
+
+test('request with wrong integrity checksum', (t) => {
+  const body = 'Hello world!'
+  const hash = 'c0535e4be2b79ffd93291305436bf889314e4a3faec05ecffcbb7df31ad9e51b'
+
+  const server = createServer((req, res) => {
+    res.end(body)
+  })
+
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, () => {
+    fetch(`http://localhost:${server.address().port}`, {
+      integrity: `sha256-${hash}`
+    }).then(response => {
+      t.pass('request did not fail')
+    }).catch((err) => {
+      t.equal(err.cause.message, 'integrity mismatch')
+    }).finally(() => {
+      t.end()
+    })
+  })
+})
+
+test('request with integrity checksum on encoded body', (t) => {
+  const body = 'Hello world!'
+  const hash = createHash('sha256').update(body).digest('base64')
+
+  const server = createServer((req, res) => {
+    res.setHeader('content-encoding', 'gzip')
+    res.end(gzipSync(body))
+  })
+
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const response = await fetch(`http://localhost:${server.address().port}`, {
+      integrity: `sha256-${hash}`
+    })
+    t.strictSame(body, await response.text())
+    t.end()
+  })
+})
+
+test('request with a totally incorrect integrity', async (t) => {
+  const server = createServer((req, res) => {
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  await t.resolves(fetch(`http://localhost:${server.address().port}`, {
+    integrity: 'what-integrityisthis'
+  }))
+})
+
+test('request with mixed in/valid integrities', async (t) => {
+  const body = 'Hello world!'
+  const hash = createHash('sha256').update(body).digest('base64')
+
+  const server = createServer((req, res) => {
+    res.end(body)
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  await t.resolves(fetch(`http://localhost:${server.address().port}`, {
+    integrity: `invalid-integrity sha256-${hash}`
+  }))
+})
+
+test('request with sha384 hash', { skip: !supportedHashes.includes('sha384') }, async (t) => {
+  const body = 'Hello world!'
+  const hash = createHash('sha384').update(body).digest('base64')
+
+  const server = createServer((req, res) => {
+    res.end(body)
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  // request should succeed
+  await t.resolves(fetch(`http://localhost:${server.address().port}`, {
+    integrity: `sha384-${hash}`
+  }))
+
+  // request should fail
+  await t.rejects(fetch(`http://localhost:${server.address().port}`, {
+    integrity: 'sha384-ypeBEsobvcr6wjGzmiPcTaeG7/gUfE5yuYB3ha/uSLs='
+  }))
+})
+
+test('request with sha512 hash', { skip: !supportedHashes.includes('sha512') }, async (t) => {
+  const body = 'Hello world!'
+  const hash = createHash('sha512').update(body).digest('base64')
+
+  const server = createServer((req, res) => {
+    res.end(body)
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  // request should succeed
+  await t.resolves(fetch(`http://localhost:${server.address().port}`, {
+    integrity: `sha512-${hash}`
+  }))
+
+  // request should fail
+  await t.rejects(fetch(`http://localhost:${server.address().port}`, {
+    integrity: 'sha512-ypeBEsobvcr6wjGzmiPcTaeG7/gUfE5yuYB3ha/uSLs='
+  }))
+})
diff --git a/test/fetch/issue-1447.js b/test/fetch/issue-1447.js
new file mode 100644
index 0000000..503b344
--- /dev/null
+++ b/test/fetch/issue-1447.js
@@ -0,0 +1,46 @@
+'use strict'
+
+const { test, skip } = require('tap')
+const { nodeMajor } = require('../../lib/core/util')
+
+if (nodeMajor === 16) {
+  skip('esbuild uses static blocks with --keep-names which node 16.8 does not have')
+  process.exit()
+}
+
+const undici = require('../..')
+const { fetch: theoreticalGlobalFetch } = require('../../undici-fetch')
+
+test('Mocking works with both fetches', async (t) => {
+  const mockAgent = new undici.MockAgent()
+  const body = JSON.stringify({ foo: 'bar' })
+
+  mockAgent.disableNetConnect()
+  undici.setGlobalDispatcher(mockAgent)
+  const pool = mockAgent.get('https://example.com')
+
+  pool.intercept({
+    path: '/path',
+    method: 'POST',
+    body (bodyString) {
+      t.equal(bodyString, body)
+      return true
+    }
+  }).reply(200, { ok: 1 }).times(2)
+
+  const url = new URL('https://example.com/path').href
+
+  // undici fetch from node_modules
+  await undici.fetch(url, {
+    method: 'POST',
+    body
+  })
+
+  // the global fetch bundled with esbuild
+  await theoreticalGlobalFetch(url, {
+    method: 'POST',
+    body
+  })
+
+  t.end()
+})
diff --git a/test/fetch/issue-2009.js b/test/fetch/issue-2009.js
new file mode 100644
index 0000000..0b7b3e9
--- /dev/null
+++ b/test/fetch/issue-2009.js
@@ -0,0 +1,28 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+const { createServer } = require('http')
+const { once } = require('events')
+
+test('issue 2009', async (t) => {
+  const server = createServer((req, res) => {
+    res.setHeader('a', 'b')
+    res.flushHeaders()
+
+    res.socket.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  for (let i = 0; i < 10; i++) {
+    await t.resolves(
+      fetch(`http://localhost:${server.address().port}`).then(
+        async (resp) => {
+          await resp.body.cancel('Some message')
+        }
+      )
+    )
+  }
+})
diff --git a/test/fetch/issue-2021.js b/test/fetch/issue-2021.js
new file mode 100644
index 0000000..cd28a71
--- /dev/null
+++ b/test/fetch/issue-2021.js
@@ -0,0 +1,32 @@
+'use strict'
+
+const { test } = require('tap')
+const { once } = require('events')
+const { createServer } = require('http')
+const { fetch } = require('../..')
+
+// https://github.com/nodejs/undici/issues/2021
+test('content-length header is removed on redirect', async (t) => {
+  const server = createServer((req, res) => {
+    if (req.url === '/redirect') {
+      res.writeHead(302, { Location: '/redirect2' })
+      res.end()
+      return
+    }
+
+    res.end()
+  }).listen(0).unref()
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const body = 'a+b+c'
+
+  await t.resolves(fetch(`http://localhost:${server.address().port}/redirect`, {
+    method: 'POST',
+    body,
+    headers: {
+      'content-length': Buffer.byteLength(body)
+    }
+  }))
+})
diff --git a/test/fetch/issue-2171.js b/test/fetch/issue-2171.js
new file mode 100644
index 0000000..b04ae0e
--- /dev/null
+++ b/test/fetch/issue-2171.js
@@ -0,0 +1,25 @@
+'use strict'
+
+const { fetch } = require('../..')
+const { DOMException } = require('../../lib/fetch/constants')
+const { once } = require('events')
+const { createServer } = require('http')
+const { test } = require('tap')
+
+test('error reason is forwarded - issue #2171', { skip: !AbortSignal.timeout }, async (t) => {
+  const server = createServer(() => {}).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const timeout = AbortSignal.timeout(100)
+  await t.rejects(
+    fetch(`http://localhost:${server.address().port}`, {
+      signal: timeout
+    }),
+    {
+      name: 'TimeoutError',
+      code: DOMException.TIMEOUT_ERR
+    }
+  )
+})
diff --git a/test/fetch/issue-2242.js b/test/fetch/issue-2242.js
new file mode 100644
index 0000000..fe70412
--- /dev/null
+++ b/test/fetch/issue-2242.js
@@ -0,0 +1,8 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+
+test('fetch with signal already aborted', async (t) => {
+  await t.rejects(fetch('http://localhost', { signal: AbortSignal.abort('Already aborted') }), 'Already aborted')
+})
diff --git a/test/fetch/issue-2318.js b/test/fetch/issue-2318.js
new file mode 100644
index 0000000..e4f610d
--- /dev/null
+++ b/test/fetch/issue-2318.js
@@ -0,0 +1,25 @@
+'use strict'
+
+const { test } = require('tap')
+const { once } = require('events')
+const { createServer } = require('http')
+const { fetch } = require('../..')
+
+test('Undici overrides user-provided `Host` header', async (t) => {
+  t.plan(1)
+
+  const server = createServer((req, res) => {
+    t.equal(req.headers.host, `localhost:${server.address().port}`)
+
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  await fetch(`http://localhost:${server.address().port}`, {
+    headers: {
+      host: 'www.idk.org'
+    }
+  })
+})
diff --git a/test/fetch/issue-node-46525.js b/test/fetch/issue-node-46525.js
new file mode 100644
index 0000000..6fd9810
--- /dev/null
+++ b/test/fetch/issue-node-46525.js
@@ -0,0 +1,28 @@
+'use strict'
+
+const { once } = require('events')
+const { createServer } = require('http')
+const { test } = require('tap')
+const { fetch } = require('../..')
+
+// https://github.com/nodejs/node/issues/46525
+test('No warning when reusing AbortController', async (t) => {
+  function onWarning (error) {
+    t.error(error, 'Got warning')
+  }
+
+  const server = createServer((req, res) => res.end()).listen(0)
+
+  await once(server, 'listening')
+
+  process.on('warning', onWarning)
+  t.teardown(() => {
+    process.off('warning', onWarning)
+    return server.close()
+  })
+
+  const controller = new AbortController()
+  for (let i = 0; i < 15; i++) {
+    await fetch(`http://localhost:${server.address().port}`, { signal: controller.signal })
+  }
+})
diff --git a/test/fetch/iterators.js b/test/fetch/iterators.js
new file mode 100644
index 0000000..6c6761d
--- /dev/null
+++ b/test/fetch/iterators.js
@@ -0,0 +1,140 @@
+'use strict'
+
+const { test } = require('tap')
+const { Headers, FormData } = require('../..')
+
+test('Implements " Iterator" properly', (t) => {
+  t.test('all Headers iterators implement Headers Iterator', (t) => {
+    const headers = new Headers([['a', 'b'], ['c', 'd']])
+
+    for (const iterable of ['keys', 'values', 'entries', Symbol.iterator]) {
+      const gen = headers[iterable]()
+      // https://tc39.es/ecma262/#sec-%25iteratorprototype%25-object
+      const IteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()))
+      const iteratorProto = Object.getPrototypeOf(gen)
+
+      t.ok(gen.constructor === Object)
+      t.ok(gen.prototype === undefined)
+      // eslint-disable-next-line no-proto
+      t.equal(gen.__proto__[Symbol.toStringTag], 'Headers Iterator')
+      // https://github.com/node-fetch/node-fetch/issues/1119#issuecomment-100222049
+      t.notOk(Headers.prototype[iterable] instanceof function * () {}.constructor)
+      // eslint-disable-next-line no-proto
+      t.ok(gen.__proto__.next.__proto__ === Function.prototype)
+      // https://webidl.spec.whatwg.org/#dfn-iterator-prototype-object
+      // "The [[Prototype]] internal slot of an iterator prototype object must be %IteratorPrototype%."
+      t.equal(gen[Symbol.iterator], IteratorPrototype[Symbol.iterator])
+      t.equal(Object.getPrototypeOf(iteratorProto), IteratorPrototype)
+    }
+
+    t.end()
+  })
+
+  t.test('all FormData iterators implement FormData Iterator', (t) => {
+    const fd = new FormData()
+
+    for (const iterable of ['keys', 'values', 'entries', Symbol.iterator]) {
+      const gen = fd[iterable]()
+      // https://tc39.es/ecma262/#sec-%25iteratorprototype%25-object
+      const IteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()))
+      const iteratorProto = Object.getPrototypeOf(gen)
+
+      t.ok(gen.constructor === Object)
+      t.ok(gen.prototype === undefined)
+      // eslint-disable-next-line no-proto
+      t.equal(gen.__proto__[Symbol.toStringTag], 'FormData Iterator')
+      // https://github.com/node-fetch/node-fetch/issues/1119#issuecomment-100222049
+      t.notOk(Headers.prototype[iterable] instanceof function * () {}.constructor)
+      // eslint-disable-next-line no-proto
+      t.ok(gen.__proto__.next.__proto__ === Function.prototype)
+      // https://webidl.spec.whatwg.org/#dfn-iterator-prototype-object
+      // "The [[Prototype]] internal slot of an iterator prototype object must be %IteratorPrototype%."
+      t.equal(gen[Symbol.iterator], IteratorPrototype[Symbol.iterator])
+      t.equal(Object.getPrototypeOf(iteratorProto), IteratorPrototype)
+    }
+
+    t.end()
+  })
+
+  t.test('Iterator symbols are properly set', (t) => {
+    t.test('Headers', (t) => {
+      const headers = new Headers([['a', 'b'], ['c', 'd']])
+      const gen = headers.entries()
+
+      t.equal(typeof gen[Symbol.toStringTag], 'string')
+      t.equal(typeof gen[Symbol.iterator], 'function')
+      t.end()
+    })
+
+    t.test('FormData', (t) => {
+      const fd = new FormData()
+      const gen = fd.entries()
+
+      t.equal(typeof gen[Symbol.toStringTag], 'string')
+      t.equal(typeof gen[Symbol.iterator], 'function')
+      t.end()
+    })
+
+    t.end()
+  })
+
+  t.test('Iterator does not inherit Generator prototype methods', (t) => {
+    t.test('Headers', (t) => {
+      const headers = new Headers([['a', 'b'], ['c', 'd']])
+      const gen = headers.entries()
+
+      t.equal(gen.return, undefined)
+      t.equal(gen.throw, undefined)
+      t.equal(typeof gen.next, 'function')
+
+      t.end()
+    })
+
+    t.test('FormData', (t) => {
+      const fd = new FormData()
+      const gen = fd.entries()
+
+      t.equal(gen.return, undefined)
+      t.equal(gen.throw, undefined)
+      t.equal(typeof gen.next, 'function')
+
+      t.end()
+    })
+
+    t.end()
+  })
+
+  t.test('Symbol.iterator', (t) => {
+    // Headers
+    const headerValues = new Headers([['a', 'b']]).entries()[Symbol.iterator]()
+    t.same(Array.from(headerValues), [['a', 'b']])
+
+    // FormData
+    const formdata = new FormData()
+    formdata.set('a', 'b')
+    const formdataValues = formdata.entries()[Symbol.iterator]()
+    t.same(Array.from(formdataValues), [['a', 'b']])
+
+    t.end()
+  })
+
+  t.test('brand check', (t) => {
+    // Headers
+    t.throws(() => {
+      const gen = new Headers().entries()
+      // eslint-disable-next-line no-proto
+      gen.__proto__.next()
+    }, TypeError)
+
+    // FormData
+    t.throws(() => {
+      const gen = new FormData().entries()
+      // eslint-disable-next-line no-proto
+      gen.__proto__.next()
+    }, TypeError)
+
+    t.end()
+  })
+
+  t.end()
+})
diff --git a/test/fetch/jsdom-abortcontroller-1910-1464495619.js b/test/fetch/jsdom-abortcontroller-1910-1464495619.js
new file mode 100644
index 0000000..e5a86ab
--- /dev/null
+++ b/test/fetch/jsdom-abortcontroller-1910-1464495619.js
@@ -0,0 +1,26 @@
+'use strict'
+
+const { test } = require('tap')
+const { createServer } = require('http')
+const { once } = require('events')
+const { fetch } = require('../..')
+const { JSDOM } = require('jsdom')
+
+// https://github.com/nodejs/undici/pull/1910#issuecomment-1464495619
+test('third party AbortControllers', async (t) => {
+  const server = createServer((_, res) => res.end()).listen(0)
+
+  const { AbortController } = new JSDOM().window
+  let controller = new AbortController()
+
+  t.teardown(() => {
+    controller.abort()
+    controller = null
+    return server.close()
+  })
+  await once(server, 'listening')
+
+  await t.resolves(fetch(`http://localhost:${server.address().port}`, {
+    signal: controller.signal
+  }))
+})
diff --git a/test/fetch/redirect-cross-origin-header.js b/test/fetch/redirect-cross-origin-header.js
new file mode 100644
index 0000000..fca48c4
--- /dev/null
+++ b/test/fetch/redirect-cross-origin-header.js
@@ -0,0 +1,48 @@
+'use strict'
+
+const { test } = require('tap')
+const { createServer } = require('http')
+const { once } = require('events')
+const { fetch } = require('../..')
+
+test('Cross-origin redirects clear forbidden headers', async (t) => {
+  t.plan(5)
+
+  const server1 = createServer((req, res) => {
+    t.equal(req.headers.cookie, undefined)
+    t.equal(req.headers.authorization, undefined)
+
+    res.end('redirected')
+  }).listen(0)
+
+  const server2 = createServer((req, res) => {
+    t.equal(req.headers.authorization, 'test')
+    t.equal(req.headers.cookie, 'ddd=dddd')
+
+    res.writeHead(302, {
+      ...req.headers,
+      Location: `http://localhost:${server1.address().port}`
+    })
+    res.end()
+  }).listen(0)
+
+  t.teardown(() => {
+    server1.close()
+    server2.close()
+  })
+
+  await Promise.all([
+    once(server1, 'listening'),
+    once(server2, 'listening')
+  ])
+
+  const res = await fetch(`http://localhost:${server2.address().port}`, {
+    headers: {
+      Authorization: 'test',
+      Cookie: 'ddd=dddd'
+    }
+  })
+
+  const text = await res.text()
+  t.equal(text, 'redirected')
+})
diff --git a/test/fetch/redirect.js b/test/fetch/redirect.js
new file mode 100644
index 0000000..7e3681b
--- /dev/null
+++ b/test/fetch/redirect.js
@@ -0,0 +1,50 @@
+'use strict'
+
+const { test } = require('tap')
+const { createServer } = require('http')
+const { once } = require('events')
+const { fetch } = require('../..')
+
+// https://github.com/nodejs/undici/issues/1776
+test('Redirecting with a body does not cancel the current request - #1776', async (t) => {
+  const server = createServer((req, res) => {
+    if (req.url === '/redirect') {
+      res.statusCode = 301
+      res.setHeader('location', '/redirect/')
+      res.write('<a href="/redirect/">Moved Permanently</a>')
+      setTimeout(() => res.end(), 500)
+      return
+    }
+
+    res.write(req.url)
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const resp = await fetch(`http://localhost:${server.address().port}/redirect`)
+  t.equal(await resp.text(), '/redirect/')
+  t.ok(resp.redirected)
+})
+
+test('Redirecting with an empty body does not throw an error - #2027', async (t) => {
+  const server = createServer((req, res) => {
+    if (req.url === '/redirect') {
+      res.statusCode = 307
+      res.setHeader('location', '/redirect/')
+      res.write('<a href="/redirect/">Moved Permanently</a>')
+      res.end()
+      return
+    }
+    res.write(req.url)
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const resp = await fetch(`http://localhost:${server.address().port}/redirect`, { method: 'PUT', body: '' })
+  t.equal(await resp.text(), '/redirect/')
+  t.ok(resp.redirected)
+})
diff --git a/test/fetch/relative-url.js b/test/fetch/relative-url.js
new file mode 100644
index 0000000..1a4f819
--- /dev/null
+++ b/test/fetch/relative-url.js
@@ -0,0 +1,110 @@
+'use strict'
+
+const { test, afterEach } = require('tap')
+const { createServer } = require('http')
+const { once } = require('events')
+const {
+  getGlobalOrigin,
+  setGlobalOrigin,
+  Response,
+  Request,
+  fetch
+} = require('../..')
+
+afterEach(() => setGlobalOrigin(undefined))
+
+test('setGlobalOrigin & getGlobalOrigin', (t) => {
+  t.equal(getGlobalOrigin(), undefined)
+
+  setGlobalOrigin('http://localhost:3000')
+  t.same(getGlobalOrigin(), new URL('http://localhost:3000'))
+
+  setGlobalOrigin(undefined)
+  t.equal(getGlobalOrigin(), undefined)
+
+  setGlobalOrigin(new URL('http://localhost:3000'))
+  t.same(getGlobalOrigin(), new URL('http://localhost:3000'))
+
+  t.throws(() => {
+    setGlobalOrigin('invalid.url')
+  }, TypeError)
+
+  t.throws(() => {
+    setGlobalOrigin('wss://invalid.protocol')
+  }, TypeError)
+
+  t.throws(() => setGlobalOrigin(true))
+
+  t.end()
+})
+
+test('Response.redirect', (t) => {
+  t.throws(() => {
+    Response.redirect('/relative/path', 302)
+  }, TypeError('Failed to parse URL from /relative/path'))
+
+  t.doesNotThrow(() => {
+    setGlobalOrigin('http://localhost:3000')
+    Response.redirect('/relative/path', 302)
+  })
+
+  setGlobalOrigin('http://localhost:3000')
+  const response = Response.redirect('/relative/path', 302)
+  // See step #7 of https://fetch.spec.whatwg.org/#dom-response-redirect
+  t.equal(response.headers.get('location'), 'http://localhost:3000/relative/path')
+
+  t.end()
+})
+
+test('new Request', (t) => {
+  t.throws(
+    () => new Request('/relative/path'),
+    TypeError('Failed to parse URL from /relative/path')
+  )
+
+  t.doesNotThrow(() => {
+    setGlobalOrigin('http://localhost:3000')
+    // eslint-disable-next-line no-new
+    new Request('/relative/path')
+  })
+
+  setGlobalOrigin('http://localhost:3000')
+  const request = new Request('/relative/path')
+  t.equal(request.url, 'http://localhost:3000/relative/path')
+
+  t.end()
+})
+
+test('fetch', async (t) => {
+  await t.rejects(async () => {
+    await fetch('/relative/path')
+  }, TypeError('Failed to parse URL from /relative/path'))
+
+  t.test('Basic fetch', async (t) => {
+    const server = createServer((req, res) => {
+      t.equal(req.url, '/relative/path')
+      res.end()
+    }).listen(0)
+
+    setGlobalOrigin(`http://localhost:${server.address().port}`)
+    t.teardown(server.close.bind(server))
+    await once(server, 'listening')
+
+    await t.resolves(fetch('/relative/path'))
+  })
+
+  t.test('fetch return', async (t) => {
+    const server = createServer((req, res) => {
+      t.equal(req.url, '/relative/path')
+      res.end()
+    }).listen(0)
+
+    setGlobalOrigin(`http://localhost:${server.address().port}`)
+    t.teardown(server.close.bind(server))
+    await once(server, 'listening')
+
+    const response = await fetch('/relative/path')
+
+    t.equal(response.url, `http://localhost:${server.address().port}/relative/path`)
+  })
+})
diff --git a/test/fetch/request.js b/test/fetch/request.js
new file mode 100644
index 0000000..db2c8e8
--- /dev/null
+++ b/test/fetch/request.js
@@ -0,0 +1,514 @@
+/* globals AbortController */
+
+'use strict'
+
+const { test, teardown } = require('tap')
+const {
+  Request,
+  Headers,
+  fetch
+} = require('../../')
+const {
+  Blob: ThirdPartyBlob,
+  FormData: ThirdPartyFormData
+} = require('formdata-node')
+
+const hasSignalReason = 'reason' in AbortSignal.prototype
+
+test('arg validation', async (t) => {
+  // constructor
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request()
+  }, TypeError)
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', 0)
+  }, TypeError)
+  t.throws(() => {
+    const url = new URL('http://asd')
+    url.password = 'asd'
+    // eslint-disable-next-line
+    new Request(url)
+  }, TypeError)
+  t.throws(() => {
+    const url = new URL('http://asd')
+    url.username = 'asd'
+    // eslint-disable-next-line
+    new Request(url)
+  }, TypeError)
+  t.doesNotThrow(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', undefined)
+  }, TypeError)
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', {
+      window: {}
+    })
+  }, TypeError)
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', {
+      window: 1
+    })
+  }, TypeError)
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', {
+      mode: 'navigate'
+    })
+  })
+
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', {
+      referrerPolicy: 'agjhagna'
+    })
+  }, TypeError)
+
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', {
+      mode: 'agjhagna'
+    })
+  }, TypeError)
+
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', {
+      credentials: 'agjhagna'
+    })
+  }, TypeError)
+
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', {
+      cache: 'agjhagna'
+    })
+  }, TypeError)
+
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', {
+      method: 'agjhagnaöööö'
+    })
+  }, TypeError)
+
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Request('http://asd', {
+      method: 'TRACE'
+    })
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.destination.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.referrer.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.referrerPolicy.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.mode.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.credentials.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.cache.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.redirect.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.integrity.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.keepalive.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.isReloadNavigation.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.isHistoryNavigation.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.signal.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    // eslint-disable-next-line no-unused-expressions
+    Request.prototype.body
+  }, TypeError)
+
+  t.throws(() => {
+    // eslint-disable-next-line no-unused-expressions
+    Request.prototype.bodyUsed
+  }, TypeError)
+
+  t.throws(() => {
+    Request.prototype.clone.call(null)
+  }, TypeError)
+
+  t.doesNotThrow(() => {
+    Request.prototype[Symbol.toStringTag].charAt(0)
+  })
+
+  for (const method of [
+    'text',
+    'json',
+    'arrayBuffer',
+    'blob',
+    'formData'
+  ]) {
+    await t.rejects(async () => {
+      await new Request('http://localhost')[method].call({
+        blob () {
+          return {
+            text () {
+              return Promise.resolve('emulating this')
+            }
+          }
+        }
+      })
+    }, TypeError)
+  }
+
+  t.end()
+})
+
+test('undefined window', t => {
+  t.doesNotThrow(() => new Request('http://asd', { window: undefined }))
+  t.end()
+})
+
+test('undefined body', t => {
+  const req = new Request('http://asd', { body: undefined })
+  t.equal(req.body, null)
+  t.end()
+})
+
+test('undefined method', t => {
+  const req = new Request('http://asd', { method: undefined })
+  t.equal(req.method, 'GET')
+  t.end()
+})
+
+test('undefined headers', t => {
+  const req = new Request('http://asd', { headers: undefined })
+  t.equal([...req.headers.entries()].length, 0)
+  t.end()
+})
+
+test('undefined referrer', t => {
+  const req = new Request('http://asd', { referrer: undefined })
+  t.equal(req.referrer, 'about:client')
+  t.end()
+})
+
+test('undefined referrerPolicy', t => {
+  const req = new Request('http://asd', { referrerPolicy: undefined })
+  t.equal(req.referrerPolicy, '')
+  t.end()
+})
+
+test('undefined mode', t => {
+  const req = new Request('http://asd', { mode: undefined })
+  t.equal(req.mode, 'cors')
+  t.end()
+})
+
+test('undefined credentials', t => {
+  const req = new Request('http://asd', { credentials: undefined })
+  t.equal(req.credentials, 'same-origin')
+  t.end()
+})
+
+test('undefined cache', t => {
+  const req = new Request('http://asd', { cache: undefined })
+  t.equal(req.cache, 'default')
+  t.end()
+})
+
+test('undefined redirect', t => {
+  const req = new Request('http://asd', { redirect: undefined })
+  t.equal(req.redirect, 'follow')
+  t.end()
+})
+
+test('undefined keepalive', t => {
+  const req = new Request('http://asd', { keepalive: undefined })
+  t.equal(req.keepalive, false)
+  t.end()
+})
+
+test('undefined integrity', t => {
+  const req = new Request('http://asd', { integrity: undefined })
+  t.equal(req.integrity, '')
+  t.end()
+})
+
+test('null integrity', t => {
+  const req = new Request('http://asd', { integrity: null })
+  t.equal(req.integrity, 'null')
+  t.end()
+})
+
+test('undefined signal', t => {
+  const req = new Request('http://asd', { signal: undefined })
+  t.equal(req.signal.aborted, false)
+  t.end()
+})
+
+test('pre aborted signal', t => {
+  const ac = new AbortController()
+  ac.abort('gwak')
+  const req = new Request('http://asd', { signal: ac.signal })
+  t.equal(req.signal.aborted, true)
+  if (hasSignalReason) {
+    t.equal(req.signal.reason, 'gwak')
+  }
+  t.end()
+})
+
+test('post aborted signal', t => {
+  t.plan(2)
+
+  const ac = new AbortController()
+  const req = new Request('http://asd', { signal: ac.signal })
+  t.equal(req.signal.aborted, false)
+  ac.signal.addEventListener('abort', () => {
+    if (hasSignalReason) {
+      t.equal(req.signal.reason, 'gwak')
+    } else {
+      t.pass()
+    }
+  }, { once: true })
+  ac.abort('gwak')
+})
+
+test('pre aborted signal cloned', t => {
+  const ac = new AbortController()
+  ac.abort('gwak')
+  const req = new Request('http://asd', { signal: ac.signal }).clone()
+  t.equal(req.signal.aborted, true)
+  if (hasSignalReason) {
+    t.equal(req.signal.reason, 'gwak')
+  }
+  t.end()
+})
+
+test('URLSearchParams body with Headers object - issue #1407', async (t) => {
+  const body = new URLSearchParams({
+    abc: 123
+  })
+
+  const request = new Request(
+    'http://localhost',
+    {
+      method: 'POST',
+      body,
+      headers: {
+        Authorization: 'test'
+      }
+    }
+  )
+
+  t.equal(request.headers.get('content-type'), 'application/x-www-form-urlencoded;charset=UTF-8')
+  t.equal(request.headers.get('authorization'), 'test')
+  t.equal(await request.text(), 'abc=123')
+})
+
+test('post aborted signal cloned', t => {
+  t.plan(2)
+
+  const ac = new AbortController()
+  const req = new Request('http://asd', { signal: ac.signal }).clone()
+  t.equal(req.signal.aborted, false)
+  ac.signal.addEventListener('abort', () => {
+    if (hasSignalReason) {
+      t.equal(req.signal.reason, 'gwak')
+    } else {
+      t.pass()
+    }
+  }, { once: true })
+  ac.abort('gwak')
+})
+
+test('Passing headers in init', (t) => {
+  // https://github.com/nodejs/undici/issues/1400
+  t.test('Headers instance', (t) => {
+    const req = new Request('http://localhost', {
+      headers: new Headers({ key: 'value' })
+    })
+
+    t.equal(req.headers.get('key'), 'value')
+    t.end()
+  })
+
+  t.test('key:value object', (t) => {
+    const req = new Request('http://localhost', {
+      headers: { key: 'value' }
+    })
+
+    t.equal(req.headers.get('key'), 'value')
+    t.end()
+  })
+
+  t.test('[key, value][]', (t) => {
+    const req = new Request('http://localhost', {
+      headers: [['key', 'value']]
+    })
+
+    t.equal(req.headers.get('key'), 'value')
+    t.end()
+  })
+
+  t.end()
+})
+
+test('Symbol.toStringTag', (t) => {
+  const req = new Request('http://localhost')
+
+  t.equal(req[Symbol.toStringTag], 'Request')
+  t.equal(Request.prototype[Symbol.toStringTag], 'Request')
+  t.end()
+})
+
+test('invalid RequestInit values', (t) => {
+  /* eslint-disable no-new */
+  t.throws(() => {
+    new Request('http://l', { mode: 'CoRs' })
+  }, TypeError, 'not exact case = error')
+
+  t.throws(() => {
+    new Request('http://l', { mode: 'random' })
+  }, TypeError)
+
+  t.throws(() => {
+    new Request('http://l', { credentials: 'OMIt' })
+  }, TypeError, 'not exact case = error')
+
+  t.throws(() => {
+    new Request('http://l', { credentials: 'random' })
+  }, TypeError)
+
+  t.throws(() => {
+    new Request('http://l', { cache: 'DeFaULt' })
+  }, TypeError, 'not exact case = error')
+
+  t.throws(() => {
+    new Request('http://l', { cache: 'random' })
+  }, TypeError)
+
+  t.throws(() => {
+    new Request('http://l', { redirect: 'FOllOW' })
+  }, TypeError, 'not exact case = error')
+
+  t.throws(() => {
+    new Request('http://l', { redirect: 'random' })
+  }, TypeError)
+  /* eslint-enable no-new */
+
+  t.end()
+})
+
+test('RequestInit.signal option', async (t) => {
+  t.throws(() => {
+    // eslint-disable-next-line no-new
+    new Request('http://asd', {
+      signal: true
+    })
+  }, TypeError)
+
+  await t.rejects(fetch('http://asd', {
+    signal: false
+  }), TypeError)
+})
+
+test('constructing Request with third party Blob body', async (t) => {
+  const blob = new ThirdPartyBlob(['text'])
+  const req = new Request('http://asd', {
+    method: 'POST',
+    body: blob
+  })
+  t.equal(await req.text(), 'text')
+})
+test('constructing Request with third party FormData body', async (t) => {
+  const form = new ThirdPartyFormData()
+  form.set('key', 'value')
+  const req = new Request('http://asd', {
+    method: 'POST',
+    body: form
+  })
+  const contentType = req.headers.get('content-type').split('=')
+  t.equal(contentType[0], 'multipart/form-data; boundary')
+  t.ok((await req.text()).startsWith(`--${contentType[1]}`))
+})
+
+// https://github.com/nodejs/undici/issues/2050
+test('set-cookie headers get cleared when passing a Request as first param', (t) => {
+  const req1 = new Request('http://localhost', {
+    headers: {
+      'set-cookie': 'a=1'
+    }
+  })
+
+  t.same([...req1.headers], [['set-cookie', 'a=1']])
+  const req2 = new Request(req1, { headers: {} })
+
+  t.same([...req2.headers], [])
+  t.same(req2.headers.getSetCookie(), [])
+  t.end()
+})
+
+// https://github.com/nodejs/undici/issues/2124
+test('request.referrer', (t) => {
+  for (const referrer of ['about://client', 'about://client:1234']) {
+    const request = new Request('http://a', { referrer })
+
+    t.equal(request.referrer, 'about:client')
+  }
+
+  t.end()
+})
+
+// https://github.com/nodejs/undici/issues/2445
+test('Clone the set-cookie header when Request is passed as the first parameter and no header is passed.', (t) => {
+  t.plan(2)
+  const request = new Request('http://localhost', { headers: { 'set-cookie': 'A' } })
+  const request2 = new Request(request)
+  request2.headers.append('set-cookie', 'B')
+  t.equal(request.headers.getSetCookie().join(', '), request.headers.get('set-cookie'))
+  t.equal(request2.headers.getSetCookie().join(', '), request2.headers.get('set-cookie'))
+})
+
+// Tests for optimization introduced in https://github.com/nodejs/undici/pull/2456
+test('keys to object prototypes method', (t) => {
+  t.plan(1)
+  const request = new Request('http://localhost', { method: 'hasOwnProperty' })
+  t.ok(typeof request.method === 'string')
+})
+
+// https://github.com/nodejs/undici/issues/2465
+test('Issue#2465', async (t) => {
+  t.plan(1)
+  const request = new Request('http://localhost', { body: new SharedArrayBuffer(0), method: 'POST' })
+  t.equal(await request.text(), '[object SharedArrayBuffer]')
+})
+
+teardown(() => process.exit())
diff --git a/test/fetch/resource-timing.js b/test/fetch/resource-timing.js
new file mode 100644
index 0000000..d266f28
--- /dev/null
+++ b/test/fetch/resource-timing.js
@@ -0,0 +1,72 @@
+'use strict'
+
+const { test } = require('tap')
+const { createServer } = require('http')
+const { nodeMajor, nodeMinor } = require('../../lib/core/util')
+const { fetch } = require('../..')
+
+const {
+  PerformanceObserver,
+  performance
+} = require('perf_hooks')
+
+const skip = nodeMajor < 18 || (nodeMajor === 18 && nodeMinor < 2)
+
+test('should create a PerformanceResourceTiming after each fetch request', { skip }, (t) => {
+  t.plan(8)
+
+  const obs = new PerformanceObserver(list => {
+    const expectedResourceEntryName = `http://localhost:${server.address().port}/`
+
+    const entries = list.getEntries()
+    t.equal(entries.length, 1)
+    const [entry] = entries
+    t.same(entry.name, expectedResourceEntryName)
+    t.strictSame(entry.entryType, 'resource')
+
+    t.ok(entry.duration >= 0)
+    t.ok(entry.startTime >= 0)
+
+    const entriesByName = list.getEntriesByName(expectedResourceEntryName)
+    t.equal(entriesByName.length, 1)
+    t.strictSame(entriesByName[0], entry)
+
+    obs.disconnect()
+    performance.clearResourceTimings()
+  })
+
+  obs.observe({ entryTypes: ['resource'] })
+
+  const server = createServer((req, res) => {
+    res.end('ok')
+  }).listen(0, async () => {
+    const body = await fetch(`http://localhost:${server.address().port}`)
+    t.strictSame('ok', await body.text())
+  })
+
+  t.teardown(server.close.bind(server))
+})
+
+test('should include encodedBodySize in performance entry', { skip }, (t) => {
+  t.plan(4)
+  const obs = new PerformanceObserver(list => {
+    const [entry] = list.getEntries()
+    t.equal(entry.encodedBodySize, 2)
+    t.equal(entry.decodedBodySize, 2)
+    t.equal(entry.transferSize, 2 + 300)
+
+    obs.disconnect()
+    performance.clearResourceTimings()
+  })
+
+  obs.observe({ entryTypes: ['resource'] })
+
+  const server = createServer((req, res) => {
+    res.end('ok')
+  }).listen(0, async () => {
+    const body = await fetch(`http://localhost:${server.address().port}`)
+    t.strictSame('ok', await body.text())
+  })
+
+  t.teardown(server.close.bind(server))
+})
diff --git a/test/fetch/response-json.js b/test/fetch/response-json.js
new file mode 100644
index 0000000..6244fbf
--- /dev/null
+++ b/test/fetch/response-json.js
@@ -0,0 +1,113 @@
+'use strict'
+
+const { test } = require('tap')
+const { Response } = require('../../')
+
+// https://github.com/web-platform-tests/wpt/pull/32825/
+
+const APPLICATION_JSON = 'application/json'
+const FOO_BAR = 'foo/bar'
+
+const INIT_TESTS = [
+  [undefined, 200, '', APPLICATION_JSON, {}],
+  [{ status: 400 }, 400, '', APPLICATION_JSON, {}],
+  [{ statusText: 'foo' }, 200, 'foo', APPLICATION_JSON, {}],
+  [{ headers: {} }, 200, '', APPLICATION_JSON, {}],
+  [{ headers: { 'content-type': FOO_BAR } }, 200, '', FOO_BAR, {}],
+  [{ headers: { 'x-foo': 'bar' } }, 200, '', APPLICATION_JSON, { 'x-foo': 'bar' }]
+]
+
+test('Check response returned by static json() with init', async (t) => {
+  for (const [init, expectedStatus, expectedStatusText, expectedContentType, expectedHeaders] of INIT_TESTS) {
+    const response = Response.json('hello world', init)
+    t.equal(response.type, 'default', "Response's type is default")
+    t.equal(response.status, expectedStatus, "Response's status is " + expectedStatus)
+    t.equal(response.statusText, expectedStatusText, "Response's statusText is " + JSON.stringify(expectedStatusText))
+    t.equal(response.headers.get('content-type'), expectedContentType, "Response's content-type is " + expectedContentType)
+    for (const key in expectedHeaders) {
+      t.equal(response.headers.get(key), expectedHeaders[key], "Response's header " + key + ' is ' + JSON.stringify(expectedHeaders[key]))
+    }
+
+    const data = await response.json()
+    t.equal(data, 'hello world', "Response's body is 'hello world'")
+  }
+
+  t.end()
+})
+
+test('Throws TypeError when calling static json() with an invalid status', (t) => {
+  const nullBodyStatus = [204, 205, 304]
+
+  for (const status of nullBodyStatus) {
+    t.throws(() => {
+      Response.json('hello world', { status })
+    }, TypeError, `Throws TypeError when calling static json() with a status of ${status}`)
+  }
+
+  t.end()
+})
+
+test('Check static json() encodes JSON objects correctly', async (t) => {
+  const response = Response.json({ foo: 'bar' })
+  const data = await response.json()
+  t.equal(typeof data, 'object', "Response's json body is an object")
+  t.equal(data.foo, 'bar', "Response's json body is { foo: 'bar' }")
+
+  t.end()
+})
+
+test('Check static json() throws when data is not encodable', (t) => {
+  t.throws(() => {
+    Response.json(Symbol('foo'))
+  }, TypeError)
+
+  t.end()
+})
+
+test('Check static json() throws when data is circular', (t) => {
+  const a = { b: 1 }
+  a.a = a
+
+  t.throws(() => {
+    Response.json(a)
+  }, TypeError)
+
+  t.end()
+})
+
+test('Check static json() propagates JSON serializer errors', (t) => {
+  class CustomError extends Error {
+    name = 'CustomError'
+  }
+
+  t.throws(() => {
+    Response.json({ get foo () { throw new CustomError('bar') } })
+  }, CustomError)
+
+  t.end()
+})
+
+// note: these tests are not part of any WPTs
+test('unserializable values', (t) => {
+  t.throws(() => {
+    Response.json(Symbol('symbol'))
+  }, TypeError)
+
+  t.throws(() => {
+    Response.json(undefined)
+  }, TypeError)
+
+  t.throws(() => {
+    Response.json()
+  }, TypeError)
+
+  t.end()
+})
+
+test('invalid init', (t) => {
+  t.throws(() => {
+    Response.json(null, 3)
+  }, TypeError)
+
+  t.end()
+})
diff --git a/test/fetch/response.js b/test/fetch/response.js
new file mode 100644
index 0000000..422c7ef
--- /dev/null
+++ b/test/fetch/response.js
@@ -0,0 +1,257 @@
+'use strict'
+
+const { test } = require('tap')
+const {
+  Response
+} = require('../../')
+const { ReadableStream } = require('stream/web')
+const {
+  Blob: ThirdPartyBlob,
+  FormData: ThirdPartyFormData
+} = require('formdata-node')
+
+test('arg validation', async (t) => {
+  // constructor
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Response(null, 0)
+  }, TypeError)
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Response(null, {
+      status: 99
+    })
+  }, RangeError)
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Response(null, {
+      status: 600
+    })
+  }, RangeError)
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Response(null, {
+      status: '600'
+    })
+  }, RangeError)
+  t.throws(() => {
+    // eslint-disable-next-line
+    new Response(null, {
+      statusText: '\u0000'
+    })
+  }, TypeError)
+
+  for (const nullStatus of [204, 205, 304]) {
+    t.throws(() => {
+      // eslint-disable-next-line
+      new Response(new ArrayBuffer(16), {
+        status: nullStatus
+      })
+    }, TypeError)
+  }
+
+  t.doesNotThrow(() => {
+    Response.prototype[Symbol.toStringTag].charAt(0)
+  }, TypeError)
+
+  t.throws(() => {
+    Response.prototype.type.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Response.prototype.url.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Response.prototype.redirected.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Response.prototype.status.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Response.prototype.ok.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Response.prototype.statusText.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    Response.prototype.headers.toString()
+  }, TypeError)
+
+  t.throws(() => {
+    // eslint-disable-next-line no-unused-expressions
+    Response.prototype.body
+  }, TypeError)
+
+  t.throws(() => {
+    // eslint-disable-next-line no-unused-expressions
+    Response.prototype.bodyUsed
+  }, TypeError)
+
+  t.throws(() => {
+    Response.prototype.clone.call(null)
+  }, TypeError)
+
+  await t.rejects(async () => {
+    await new Response('http://localhost').text.call({
+      blob () {
+        return {
+          text () {
+            return Promise.resolve('emulating response.blob()')
+          }
+        }
+      }
+    })
+  }, TypeError)
+
+  t.end()
+})
+
+test('response clone', (t) => {
+  // https://github.com/nodejs/undici/issues/1122
+  const response1 = new Response(null, { status: 201 })
+  const response2 = new Response(undefined, { status: 201 })
+
+  t.equal(response1.body, response1.clone().body)
+  t.equal(response2.body, response2.clone().body)
+  t.equal(response2.body, null)
+  t.end()
+})
+
+test('Symbol.toStringTag', (t) => {
+  const resp = new Response()
+
+  t.equal(resp[Symbol.toStringTag], 'Response')
+  t.equal(Response.prototype[Symbol.toStringTag], 'Response')
+  t.end()
+})
+
+test('async iterable body', async (t) => {
+  const asyncIterable = {
+    async * [Symbol.asyncIterator] () {
+      yield 'a'
+      yield 'b'
+      yield 'c'
+    }
+  }
+
+  const response = new Response(asyncIterable)
+  t.equal(await response.text(), 'abc')
+  t.end()
+})
+
+// https://github.com/nodejs/node/pull/43752#issuecomment-1179678544
+test('Modifying headers using Headers.prototype.set', (t) => {
+  const response = new Response('body', {
+    headers: {
+      'content-type': 'test/test',
+      'Content-Encoding': 'hello/world'
+    }
+  })
+
+  const response2 = response.clone()
+
+  response.headers.set('content-type', 'application/wasm')
+  response.headers.set('Content-Encoding', 'world/hello')
+
+  t.equal(response.headers.get('content-type'), 'application/wasm')
+  t.equal(response.headers.get('Content-Encoding'), 'world/hello')
+
+  response2.headers.delete('content-type')
+  response2.headers.delete('Content-Encoding')
+
+  t.equal(response2.headers.get('content-type'), null)
+  t.equal(response2.headers.get('Content-Encoding'), null)
+
+  t.end()
+})
+
+// https://github.com/nodejs/node/issues/43838
+test('constructing a Response with a ReadableStream body', { skip: process.version.startsWith('v16.') }, async (t) => {
+  const text = '{"foo":"bar"}'
+  const uint8 = new TextEncoder().encode(text)
+
+  t.test('Readable stream with Uint8Array chunks', async (t) => {
+    const readable = new ReadableStream({
+      start (controller) {
+        controller.enqueue(uint8)
+        controller.close()
+      }
+    })
+
+    const response1 = new Response(readable)
+    const response2 = response1.clone()
+    const response3 = response1.clone()
+
+    t.equal(await response1.text(), text)
+    t.same(await response2.arrayBuffer(), uint8.buffer)
+    t.same(await response3.json(), JSON.parse(text))
+
+    t.end()
+  })
+
+  t.test('Readable stream with non-Uint8Array chunks', async (t) => {
+    const readable = new ReadableStream({
+      start (controller) {
+        controller.enqueue(text) // string
+        controller.close()
+      }
+    })
+
+    const response = new Response(readable)
+
+    await t.rejects(response.text(), TypeError)
+
+    t.end()
+  })
+
+  t.test('Readable with ArrayBuffer chunk still throws', { skip: process.version.startsWith('v16.') }, async (t) => {
+    const readable = new ReadableStream({
+      start (controller) {
+        controller.enqueue(uint8.buffer)
+        controller.close()
+      }
+    })
+
+    const response1 = new Response(readable)
+    const response2 = response1.clone()
+    const response3 = response1.clone()
+    // const response4 = response1.clone()
+
+    await t.rejects(response1.arrayBuffer(), TypeError)
+    await t.rejects(response2.text(), TypeError)
+    await t.rejects(response3.json(), TypeError)
+    // TODO: on Node v16.8.0, this throws a TypeError
+    // because the body is detected as disturbed.
+    // await t.rejects(response4.blob(), TypeError)
+
+    t.end()
+  })
+
+  t.end()
+})
+
+test('constructing Response with third party Blob body', async (t) => {
+  const blob = new ThirdPartyBlob(['text'])
+  const res = new Response(blob)
+  t.equal(await res.text(), 'text')
+})
+test('constructing Response with third party FormData body', async (t) => {
+  const form = new ThirdPartyFormData()
+  form.set('key', 'value')
+  const res = new Response(form)
+  const contentType = res.headers.get('content-type').split('=')
+  t.equal(contentType[0], 'multipart/form-data; boundary')
+  t.ok((await res.text()).startsWith(`--${contentType[1]}`))
+})
+
+// https://github.com/nodejs/undici/issues/2465
+test('Issue#2465', async (t) => {
+  t.plan(1)
+  const response = new Response(new SharedArrayBuffer(0))
+  t.equal(await response.text(), '[object SharedArrayBuffer]')
+})
diff --git a/test/fetch/user-agent.js b/test/fetch/user-agent.js
new file mode 100644
index 0000000..2e37ea5
--- /dev/null
+++ b/test/fetch/user-agent.js
@@ -0,0 +1,32 @@
+'use strict'
+
+const { test, skip } = require('tap')
+const events = require('events')
+const http = require('http')
+const undici = require('../../')
+const { nodeMajor } = require('../../lib/core/util')
+
+if (nodeMajor === 16) {
+  skip('esbuild uses static blocks with --keep-names which node 16.8 does not have')
+  process.exit()
+}
+
+const nodeBuild = require('../../undici-fetch.js')
+
+test('user-agent defaults correctly', async (t) => {
+  const server = http.createServer((req, res) => {
+    res.end(JSON.stringify({ userAgentHeader: req.headers['user-agent'] }))
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0)
+  await events.once(server, 'listening')
+  const url = `http://localhost:${server.address().port}`
+  const [nodeBuildJSON, undiciJSON] = await Promise.all([
+    nodeBuild.fetch(url).then((body) => body.json()),
+    undici.fetch(url).then((body) => body.json())
+  ])
+
+  t.same(nodeBuildJSON.userAgentHeader, 'node')
+  t.same(undiciJSON.userAgentHeader, 'undici')
+})
diff --git a/test/fetch/util.js b/test/fetch/util.js
new file mode 100644
index 0000000..02b75bc
--- /dev/null
+++ b/test/fetch/util.js
@@ -0,0 +1,281 @@
+'use strict'
+
+const t = require('tap')
+const { test } = t
+
+const util = require('../../lib/fetch/util')
+const { HeadersList } = require('../../lib/fetch/headers')
+
+test('responseURL', (t) => {
+  t.plan(2)
+
+  t.ok(util.responseURL({
+    urlList: [
+      new URL('http://asd'),
+      new URL('http://fgh')
+    ]
+  }))
+  t.notOk(util.responseURL({
+    urlList: []
+  }))
+})
+
+test('responseLocationURL', (t) => {
+  t.plan(3)
+
+  const acceptHeaderList = new HeadersList()
+  acceptHeaderList.append('Accept', '*/*')
+
+  const locationHeaderList = new HeadersList()
+  locationHeaderList.append('Location', 'http://asd')
+
+  t.notOk(util.responseLocationURL({
+    status: 200
+  }))
+  t.notOk(util.responseLocationURL({
+    status: 301,
+    headersList: acceptHeaderList
+  }))
+  t.ok(util.responseLocationURL({
+    status: 301,
+    headersList: locationHeaderList,
+    urlList: [
+      new URL('http://asd'),
+      new URL('http://fgh')
+    ]
+  }))
+})
+
+test('requestBadPort', (t) => {
+  t.plan(3)
+
+  t.equal('allowed', util.requestBadPort({
+    urlList: [new URL('https://asd')]
+  }))
+  t.equal('blocked', util.requestBadPort({
+    urlList: [new URL('http://asd:7')]
+  }))
+  t.equal('blocked', util.requestBadPort({
+    urlList: [new URL('https://asd:7')]
+  }))
+})
+
+// https://html.spec.whatwg.org/multipage/origin.html#same-origin
+// look at examples
+test('sameOrigin', (t) => {
+  t.test('first test', (t) => {
+    const A = {
+      protocol: 'https:',
+      hostname: 'example.org',
+      port: ''
+    }
+
+    const B = {
+      protocol: 'https:',
+      hostname: 'example.org',
+      port: ''
+    }
+
+    t.ok(util.sameOrigin(A, B))
+    t.end()
+  })
+
+  t.test('second test', (t) => {
+    const A = {
+      protocol: 'https:',
+      hostname: 'example.org',
+      port: '314'
+    }
+
+    const B = {
+      protocol: 'https:',
+      hostname: 'example.org',
+      port: '420'
+    }
+
+    t.notOk(util.sameOrigin(A, B))
+    t.end()
+  })
+
+  t.test('obviously shouldn\'t be equal', (t) => {
+    t.notOk(util.sameOrigin(
+      { protocol: 'http:', hostname: 'example.org' },
+      { protocol: 'https:', hostname: 'example.org' }
+    ))
+
+    t.notOk(util.sameOrigin(
+      { protocol: 'https:', hostname: 'example.org' },
+      { protocol: 'https:', hostname: 'example.com' }
+    ))
+
+    t.end()
+  })
+
+  t.test('file:// urls', (t) => {
+    // urls with opaque origins should return true
+
+    const a = new URL('file:///C:/undici')
+    const b = new URL('file:///var/undici')
+
+    t.ok(util.sameOrigin(a, b))
+    t.end()
+  })
+
+  t.end()
+})
+
+test('isURLPotentiallyTrustworthy', (t) => {
+  const valid = ['http://127.0.0.1', 'http://localhost.localhost',
+    'http://[::1]', 'http://adb.localhost', 'https://something.com', 'wss://hello.com',
+    'file:///link/to/file.txt', 'data:text/plain;base64,randomstring', 'about:blank', 'about:srcdoc']
+  const invalid = ['http://121.3.4.5:55', 'null:8080', 'something:8080']
+
+  t.plan(valid.length + invalid.length + 1)
+  t.notOk(util.isURLPotentiallyTrustworthy('string'))
+
+  for (const url of valid) {
+    const instance = new URL(url)
+    t.ok(util.isURLPotentiallyTrustworthy(instance))
+  }
+
+  for (const url of invalid) {
+    const instance = new URL(url)
+    t.notOk(util.isURLPotentiallyTrustworthy(instance))
+  }
+})
+
+test('setRequestReferrerPolicyOnRedirect', nested => {
+  nested.plan(7)
+
+  nested.test('should set referrer policy from response headers on redirect', t => {
+    const request = {
+      referrerPolicy: 'no-referrer, strict-origin-when-cross-origin'
+    }
+
+    const actualResponse = {
+      headersList: new HeadersList()
+    }
+
+    t.plan(1)
+
+    actualResponse.headersList.append('Connection', 'close')
+    actualResponse.headersList.append('Location', 'https://some-location.com/redirect')
+    actualResponse.headersList.append('Referrer-Policy', 'origin')
+    util.setRequestReferrerPolicyOnRedirect(request, actualResponse)
+
+    t.equal(request.referrerPolicy, 'origin')
+  })
+
+  nested.test('should select the first valid policy from a response', t => {
+    const request = {
+      referrerPolicy: 'no-referrer, strict-origin-when-cross-origin'
+    }
+
+    const actualResponse = {
+      headersList: new HeadersList()
+    }
+
+    t.plan(1)
+
+    actualResponse.headersList.append('Connection', 'close')
+    actualResponse.headersList.append('Location', 'https://some-location.com/redirect')
+    actualResponse.headersList.append('Referrer-Policy', 'asdas, origin')
+    util.setRequestReferrerPolicyOnRedirect(request, actualResponse)
+
+    t.equal(request.referrerPolicy, 'origin')
+  })
+
+  nested.test('should select the first valid policy from a response#2', t => {
+    const request = {
+      referrerPolicy: 'no-referrer, strict-origin-when-cross-origin'
+    }
+
+    const actualResponse = {
+      headersList: new HeadersList()
+    }
+
+    t.plan(1)
+
+    actualResponse.headersList.append('Connection', 'close')
+    actualResponse.headersList.append('Location', 'https://some-location.com/redirect')
+    actualResponse.headersList.append('Referrer-Policy', 'no-referrer, asdas, origin, 0943sd')
+    util.setRequestReferrerPolicyOnRedirect(request, actualResponse)
+
+    t.equal(request.referrerPolicy, 'origin')
+  })
+
+  nested.test('should pick the last fallback over invalid policy tokens', t => {
+    const request = {
+      referrerPolicy: 'no-referrer, strict-origin-when-cross-origin'
+    }
+
+    const actualResponse = {
+      headersList: new HeadersList()
+    }
+
+    t.plan(1)
+
+    actualResponse.headersList.append('Connection', 'close')
+    actualResponse.headersList.append('Location', 'https://some-location.com/redirect')
+    actualResponse.headersList.append('Referrer-Policy', 'origin, asdas, asdaw34')
+    util.setRequestReferrerPolicyOnRedirect(request, actualResponse)
+
+    t.equal(request.referrerPolicy, 'origin')
+  })
+
+  nested.test('should set not change request referrer policy if no Referrer-Policy from initial redirect response', t => {
+    const request = {
+      referrerPolicy: 'no-referrer, strict-origin-when-cross-origin'
+    }
+
+    const actualResponse = {
+      headersList: new HeadersList()
+    }
+
+    t.plan(1)
+
+    actualResponse.headersList.append('Connection', 'close')
+    actualResponse.headersList.append('Location', 'https://some-location.com/redirect')
+    util.setRequestReferrerPolicyOnRedirect(request, actualResponse)
+
+    t.equal(request.referrerPolicy, 'no-referrer, strict-origin-when-cross-origin')
+  })
+
+  nested.test('should set not change request referrer policy if the policy is a non-valid Referrer Policy', t => {
+    const initial = 'no-referrer, strict-origin-when-cross-origin'
+    const request = {
+      referrerPolicy: initial
+    }
+    const actualResponse = {
+      headersList: new HeadersList()
+    }
+
+    t.plan(1)
+
+    actualResponse.headersList.append('Connection', 'close')
+    actualResponse.headersList.append('Location', 'https://some-location.com/redirect')
+    actualResponse.headersList.append('Referrer-Policy', 'asdasd')
+    util.setRequestReferrerPolicyOnRedirect(request, actualResponse)
+
+    t.equal(request.referrerPolicy, initial)
+  })
+
+  nested.test('should set not change request referrer policy if the policy is a non-valid Referrer Policy', t => {
+    const initial = 'no-referrer, strict-origin-when-cross-origin'
+    const request = {
+      referrerPolicy: initial
+    }
+    const actualResponse = {
+      headersList: new HeadersList()
+    }
+
+    t.plan(1)
+
+    actualResponse.headersList.append('Connection', 'close')
+    actualResponse.headersList.append('Location', 'https://some-location.com/redirect')
+    actualResponse.headersList.append('Referrer-Policy', 'asdasd, asdasa, 12daw,')
+    util.setRequestReferrerPolicyOnRedirect(request, actualResponse)
+
+    t.equal(request.referrerPolicy, initial)
+  })
+})