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diff --git a/test/wpt/tests/fetch/http-cache/README.md b/test/wpt/tests/fetch/http-cache/README.md new file mode 100644 index 0000000..512c422 --- /dev/null +++ b/test/wpt/tests/fetch/http-cache/README.md @@ -0,0 +1,72 @@ +## HTTP Caching Tests + +These tests cover HTTP-specified behaviours for caches, primarily from +[RFC9111](https://www.rfc-editor.org/rfc/rfc9111.html), but as seen through the +lens of Fetch. + +A few notes: + +* By its nature, [caching is entirely optional]( + https://www.rfc-editor.org/rfc/rfc9111.html#section-2-2); + some tests expecting a response to be + cached might fail because the client chose not to cache it, or chose to + race the cache with a network request. + +* Likewise, some tests might fail because there is a separate document-level + cache that's not well defined; see [this + issue](https://github.com/whatwg/fetch/issues/354). + +* [Partial content tests](partial.any.js) (a.k.a. Range requests) are not specified + in Fetch; tests are included here for interest only. + +* Some browser caches will behave differently when reloading / + shift-reloading, despite the `cache mode` staying the same. + +* [cache-tests.fyi](https://cache-tests.fyi/) is another test suite of HTTP caching + which also caters to server/CDN implementations. + +## Test Format + +Each test run gets its own URL and randomized content and operates independently. + +Each test is an an array of objects, with the following members: + +- `name` - The name of the test. +- `requests` - a list of request objects (see below). + +Possible members of a request object: + +- template - A template object for the request, by name. +- request_method - A string containing the HTTP method to be used. +- request_headers - An array of `[header_name_string, header_value_string]` arrays to + emit in the request. +- request_body - A string to use as the request body. +- mode - The mode string to pass to `fetch()`. +- credentials - The credentials string to pass to `fetch()`. +- cache - The cache string to pass to `fetch()`. +- pause_after - Boolean controlling a 3-second pause after the request completes. +- response_status - A `[number, string]` array containing the HTTP status code + and phrase to return. +- response_headers - An array of `[header_name_string, header_value_string]` arrays to + emit in the response. These values will also be checked like + expected_response_headers, unless there is a third value that is + `false`. See below for special handling considerations. +- response_body - String to send as the response body. If not set, it will contain + the test identifier. +- expected_type - One of `["cached", "not_cached", "lm_validate", "etag_validate", "error"]` +- expected_status - A number representing a HTTP status code to check the response for. + If not set, the value of `response_status[0]` will be used; if that + is not set, 200 will be used. +- expected_request_headers - An array of `[header_name_string, header_value_string]` representing + headers to check the request for. +- expected_response_headers - An array of `[header_name_string, header_value_string]` representing + headers to check the response for. See also response_headers. +- expected_response_text - A string to check the response body against. If not present, `response_body` will be checked if present and non-null; otherwise the response body will be checked for the test uuid (unless the status code disallows a body). Set to `null` to disable all response body checking. + +Some headers in `response_headers` are treated specially: + +* For date-carrying headers, if the value is a number, it will be interpreted as a delta to the time of the first request at the server. +* For URL-carrying headers, the value will be appended as a query parameter for `target`. + +See the source for exact details. + |