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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package http_test
import (
"context"
"fmt"
"io"
"log"
"net/http"
"os"
"os/signal"
)
func ExampleHijacker() {
http.HandleFunc("/hijack", func(w http.ResponseWriter, r *http.Request) {
hj, ok := w.(http.Hijacker)
if !ok {
http.Error(w, "webserver doesn't support hijacking", http.StatusInternalServerError)
return
}
conn, bufrw, err := hj.Hijack()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// Don't forget to close the connection:
defer conn.Close()
bufrw.WriteString("Now we're speaking raw TCP. Say hi: ")
bufrw.Flush()
s, err := bufrw.ReadString('\n')
if err != nil {
log.Printf("error reading string: %v", err)
return
}
fmt.Fprintf(bufrw, "You said: %q\nBye.\n", s)
bufrw.Flush()
})
}
func ExampleGet() {
res, err := http.Get("http://www.google.com/robots.txt")
if err != nil {
log.Fatal(err)
}
robots, err := io.ReadAll(res.Body)
res.Body.Close()
if err != nil {
log.Fatal(err)
}
fmt.Printf("%s", robots)
}
func ExampleFileServer() {
// Simple static webserver:
log.Fatal(http.ListenAndServe(":8080", http.FileServer(http.Dir("/usr/share/doc"))))
}
func ExampleFileServer_stripPrefix() {
// To serve a directory on disk (/tmp) under an alternate URL
// path (/tmpfiles/), use StripPrefix to modify the request
// URL's path before the FileServer sees it:
http.Handle("/tmpfiles/", http.StripPrefix("/tmpfiles/", http.FileServer(http.Dir("/tmp"))))
}
func ExampleStripPrefix() {
// To serve a directory on disk (/tmp) under an alternate URL
// path (/tmpfiles/), use StripPrefix to modify the request
// URL's path before the FileServer sees it:
http.Handle("/tmpfiles/", http.StripPrefix("/tmpfiles/", http.FileServer(http.Dir("/tmp"))))
}
type apiHandler struct{}
func (apiHandler) ServeHTTP(http.ResponseWriter, *http.Request) {}
func ExampleServeMux_Handle() {
mux := http.NewServeMux()
mux.Handle("/api/", apiHandler{})
mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
// The "/" pattern matches everything, so we need to check
// that we're at the root here.
if req.URL.Path != "/" {
http.NotFound(w, req)
return
}
fmt.Fprintf(w, "Welcome to the home page!")
})
}
// HTTP Trailers are a set of key/value pairs like headers that come
// after the HTTP response, instead of before.
func ExampleResponseWriter_trailers() {
mux := http.NewServeMux()
mux.HandleFunc("/sendstrailers", func(w http.ResponseWriter, req *http.Request) {
// Before any call to WriteHeader or Write, declare
// the trailers you will set during the HTTP
// response. These three headers are actually sent in
// the trailer.
w.Header().Set("Trailer", "AtEnd1, AtEnd2")
w.Header().Add("Trailer", "AtEnd3")
w.Header().Set("Content-Type", "text/plain; charset=utf-8") // normal header
w.WriteHeader(http.StatusOK)
w.Header().Set("AtEnd1", "value 1")
io.WriteString(w, "This HTTP response has both headers before this text and trailers at the end.\n")
w.Header().Set("AtEnd2", "value 2")
w.Header().Set("AtEnd3", "value 3") // These will appear as trailers.
})
}
func ExampleServer_Shutdown() {
var srv http.Server
idleConnsClosed := make(chan struct{})
go func() {
sigint := make(chan os.Signal, 1)
signal.Notify(sigint, os.Interrupt)
<-sigint
// We received an interrupt signal, shut down.
if err := srv.Shutdown(context.Background()); err != nil {
// Error from closing listeners, or context timeout:
log.Printf("HTTP server Shutdown: %v", err)
}
close(idleConnsClosed)
}()
if err := srv.ListenAndServe(); err != http.ErrServerClosed {
// Error starting or closing listener:
log.Fatalf("HTTP server ListenAndServe: %v", err)
}
<-idleConnsClosed
}
func ExampleListenAndServeTLS() {
http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
io.WriteString(w, "Hello, TLS!\n")
})
// One can use generate_cert.go in crypto/tls to generate cert.pem and key.pem.
log.Printf("About to listen on 8443. Go to https://127.0.0.1:8443/")
err := http.ListenAndServeTLS(":8443", "cert.pem", "key.pem", nil)
log.Fatal(err)
}
func ExampleListenAndServe() {
// Hello world, the web server
helloHandler := func(w http.ResponseWriter, req *http.Request) {
io.WriteString(w, "Hello, world!\n")
}
http.HandleFunc("/hello", helloHandler)
log.Fatal(http.ListenAndServe(":8080", nil))
}
func ExampleHandleFunc() {
h1 := func(w http.ResponseWriter, _ *http.Request) {
io.WriteString(w, "Hello from a HandleFunc #1!\n")
}
h2 := func(w http.ResponseWriter, _ *http.Request) {
io.WriteString(w, "Hello from a HandleFunc #2!\n")
}
http.HandleFunc("/", h1)
http.HandleFunc("/endpoint", h2)
log.Fatal(http.ListenAndServe(":8080", nil))
}
func newPeopleHandler() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln(w, "This is the people handler.")
})
}
func ExampleNotFoundHandler() {
mux := http.NewServeMux()
// Create sample handler to returns 404
mux.Handle("/resources", http.NotFoundHandler())
// Create sample handler that returns 200
mux.Handle("/resources/people/", newPeopleHandler())
log.Fatal(http.ListenAndServe(":8080", mux))
}
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