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Source file src/net/http/doc.go

  // Copyright 2011 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 provides HTTP client and server implementations.
  Get, Head, Post, and PostForm make HTTP (or HTTPS) requests:
  	resp, err := http.Get("http://example.com/")
  	resp, err := http.Post("http://example.com/upload", "image/jpeg", &buf)
  	resp, err := http.PostForm("http://example.com/form",
  		url.Values{"key": {"Value"}, "id": {"123"}})
  The client must close the response body when finished with it:
  	resp, err := http.Get("http://example.com/")
  	if err != nil {
  		// handle error
  	defer resp.Body.Close()
  	body, err := ioutil.ReadAll(resp.Body)
  	// ...
  For control over HTTP client headers, redirect policy, and other
  settings, create a Client:
  	client := &http.Client{
  		CheckRedirect: redirectPolicyFunc,
  	resp, err := client.Get("http://example.com")
  	// ...
  	req, err := http.NewRequest("GET", "http://example.com", nil)
  	// ...
  	req.Header.Add("If-None-Match", `W/"wyzzy"`)
  	resp, err := client.Do(req)
  	// ...
  For control over proxies, TLS configuration, keep-alives,
  compression, and other settings, create a Transport:
  	tr := &http.Transport{
  		MaxIdleConns:       10,
  		IdleConnTimeout:    30 * time.Second,
  		DisableCompression: true,
  	client := &http.Client{Transport: tr}
  	resp, err := client.Get("https://example.com")
  Clients and Transports are safe for concurrent use by multiple
  goroutines and for efficiency should only be created once and re-used.
  ListenAndServe starts an HTTP server with a given address and handler.
  The handler is usually nil, which means to use DefaultServeMux.
  Handle and HandleFunc add handlers to DefaultServeMux:
  	http.Handle("/foo", fooHandler)
  	http.HandleFunc("/bar", func(w http.ResponseWriter, r *http.Request) {
  		fmt.Fprintf(w, "Hello, %q", html.EscapeString(r.URL.Path))
  	log.Fatal(http.ListenAndServe(":8080", nil))
  More control over the server's behavior is available by creating a
  custom Server:
  	s := &http.Server{
  		Addr:           ":8080",
  		Handler:        myHandler,
  		ReadTimeout:    10 * time.Second,
  		WriteTimeout:   10 * time.Second,
  		MaxHeaderBytes: 1 << 20,
  Starting with Go 1.6, the http package has transparent support for the
  HTTP/2 protocol when using HTTPS. Programs that must disable HTTP/2
  can do so by setting Transport.TLSNextProto (for clients) or
  Server.TLSNextProto (for servers) to a non-nil, empty
  map. Alternatively, the following GODEBUG environment variables are
  currently supported:
  	GODEBUG=http2client=0  # disable HTTP/2 client support
  	GODEBUG=http2server=0  # disable HTTP/2 server support
  	GODEBUG=http2debug=1   # enable verbose HTTP/2 debug logs
  	GODEBUG=http2debug=2   # ... even more verbose, with frame dumps
  The GODEBUG variables are not covered by Go's API compatibility
  promise. Please report any issues before disabling HTTP/2
  support: https://golang.org/s/http2bug
  The http package's Transport and Server both automatically enable
  HTTP/2 support for simple configurations. To enable HTTP/2 for more
  complex configurations, to use lower-level HTTP/2 features, or to use
  a newer version of Go's http2 package, import "golang.org/x/net/http2"
  directly and use its ConfigureTransport and/or ConfigureServer
  functions. Manually configuring HTTP/2 via the golang.org/x/net/http2
  package takes precedence over the net/http package's built-in HTTP/2
  package http

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