mirror of
https://github.com/golang/go
synced 2024-10-07 11:21:22 -06:00
9733f96b47
Fixes #1558 R=rsc, r, bradfitzwork CC=golang-dev https://golang.org/cl/4260042
321 lines
9.0 KiB
Go
321 lines
9.0 KiB
Go
// Copyright 2009 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.
|
|
|
|
// Primitive HTTP client. See RFC 2616.
|
|
|
|
package http
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/base64"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
// A Client is an HTTP client. Its zero value (DefaultClient) is a usable client
|
|
// that uses DefaultTransport.
|
|
// Client is not yet very configurable.
|
|
type Client struct {
|
|
Transport ClientTransport // if nil, DefaultTransport is used
|
|
}
|
|
|
|
// DefaultClient is the default Client and is used by Get, Head, and Post.
|
|
var DefaultClient = &Client{}
|
|
|
|
// ClientTransport is an interface representing the ability to execute a
|
|
// single HTTP transaction, obtaining the Response for a given Request.
|
|
type ClientTransport interface {
|
|
// Do executes a single HTTP transaction, returning the Response for the
|
|
// request req. Do should not attempt to interpret the response.
|
|
// In particular, Do must return err == nil if it obtained a response,
|
|
// regardless of the response's HTTP status code. A non-nil err should
|
|
// be reserved for failure to obtain a response. Similarly, Do should
|
|
// not attempt to handle higher-level protocol details such as redirects,
|
|
// authentication, or cookies.
|
|
//
|
|
// Transports may modify the request. The request Headers field is
|
|
// guaranteed to be initalized.
|
|
Do(req *Request) (resp *Response, err os.Error)
|
|
}
|
|
|
|
// Given a string of the form "host", "host:port", or "[ipv6::address]:port",
|
|
// return true if the string includes a port.
|
|
func hasPort(s string) bool { return strings.LastIndex(s, ":") > strings.LastIndex(s, "]") }
|
|
|
|
// Used in Send to implement io.ReadCloser by bundling together the
|
|
// bufio.Reader through which we read the response, and the underlying
|
|
// network connection.
|
|
type readClose struct {
|
|
io.Reader
|
|
io.Closer
|
|
}
|
|
|
|
// matchNoProxy returns true if requests to addr should not use a proxy,
|
|
// according to the NO_PROXY or no_proxy environment variable.
|
|
func matchNoProxy(addr string) bool {
|
|
if len(addr) == 0 {
|
|
return false
|
|
}
|
|
no_proxy := os.Getenv("NO_PROXY")
|
|
if len(no_proxy) == 0 {
|
|
no_proxy = os.Getenv("no_proxy")
|
|
}
|
|
if no_proxy == "*" {
|
|
return true
|
|
}
|
|
|
|
addr = strings.ToLower(strings.TrimSpace(addr))
|
|
if hasPort(addr) {
|
|
addr = addr[:strings.LastIndex(addr, ":")]
|
|
}
|
|
|
|
for _, p := range strings.Split(no_proxy, ",", -1) {
|
|
p = strings.ToLower(strings.TrimSpace(p))
|
|
if len(p) == 0 {
|
|
continue
|
|
}
|
|
if hasPort(p) {
|
|
p = p[:strings.LastIndex(p, ":")]
|
|
}
|
|
if addr == p || (p[0] == '.' && (strings.HasSuffix(addr, p) || addr == p[1:])) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Do sends an HTTP request and returns an HTTP response, following
|
|
// policy (e.g. redirects, cookies, auth) as configured on the client.
|
|
//
|
|
// Callers should close resp.Body when done reading from it.
|
|
//
|
|
// Generally Get, Post, or PostForm will be used instead of Do.
|
|
func (c *Client) Do(req *Request) (resp *Response, err os.Error) {
|
|
return send(req, c.Transport)
|
|
}
|
|
|
|
|
|
// send issues an HTTP request. Caller should close resp.Body when done reading from it.
|
|
//
|
|
// TODO: support persistent connections (multiple requests on a single connection).
|
|
// send() method is nonpublic because, when we refactor the code for persistent
|
|
// connections, it may no longer make sense to have a method with this signature.
|
|
func send(req *Request, t ClientTransport) (resp *Response, err os.Error) {
|
|
if t == nil {
|
|
t = DefaultTransport
|
|
if t == nil {
|
|
err = os.NewError("no http.Client.Transport or http.DefaultTransport")
|
|
return
|
|
}
|
|
}
|
|
|
|
// Most the callers of send (Get, Post, et al) don't need
|
|
// Headers, leaving it uninitialized. We guarantee to the
|
|
// ClientTransport that this has been initialized, though.
|
|
if req.Header == nil {
|
|
req.Header = Header(make(map[string][]string))
|
|
}
|
|
|
|
info := req.URL.RawUserinfo
|
|
if len(info) > 0 {
|
|
enc := base64.URLEncoding
|
|
encoded := make([]byte, enc.EncodedLen(len(info)))
|
|
enc.Encode(encoded, []byte(info))
|
|
if req.Header == nil {
|
|
req.Header = make(Header)
|
|
}
|
|
req.Header.Set("Authorization", "Basic "+string(encoded))
|
|
}
|
|
return t.Do(req)
|
|
}
|
|
|
|
// True if the specified HTTP status code is one for which the Get utility should
|
|
// automatically redirect.
|
|
func shouldRedirect(statusCode int) bool {
|
|
switch statusCode {
|
|
case StatusMovedPermanently, StatusFound, StatusSeeOther, StatusTemporaryRedirect:
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Get issues a GET to the specified URL. If the response is one of the following
|
|
// redirect codes, it follows the redirect, up to a maximum of 10 redirects:
|
|
//
|
|
// 301 (Moved Permanently)
|
|
// 302 (Found)
|
|
// 303 (See Other)
|
|
// 307 (Temporary Redirect)
|
|
//
|
|
// finalURL is the URL from which the response was fetched -- identical to the
|
|
// input URL unless redirects were followed.
|
|
//
|
|
// Caller should close r.Body when done reading from it.
|
|
//
|
|
// Get is a convenience wrapper around DefaultClient.Get.
|
|
func Get(url string) (r *Response, finalURL string, err os.Error) {
|
|
return DefaultClient.Get(url)
|
|
}
|
|
|
|
// Get issues a GET to the specified URL. If the response is one of the following
|
|
// redirect codes, it follows the redirect, up to a maximum of 10 redirects:
|
|
//
|
|
// 301 (Moved Permanently)
|
|
// 302 (Found)
|
|
// 303 (See Other)
|
|
// 307 (Temporary Redirect)
|
|
//
|
|
// finalURL is the URL from which the response was fetched -- identical to the
|
|
// input URL unless redirects were followed.
|
|
//
|
|
// Caller should close r.Body when done reading from it.
|
|
func (c *Client) Get(url string) (r *Response, finalURL string, err os.Error) {
|
|
// TODO: if/when we add cookie support, the redirected request shouldn't
|
|
// necessarily supply the same cookies as the original.
|
|
// TODO: set referrer header on redirects.
|
|
var base *URL
|
|
// TODO: remove this hard-coded 10 and use the Client's policy
|
|
// (ClientConfig) instead.
|
|
for redirect := 0; ; redirect++ {
|
|
if redirect >= 10 {
|
|
err = os.ErrorString("stopped after 10 redirects")
|
|
break
|
|
}
|
|
|
|
var req Request
|
|
req.Method = "GET"
|
|
req.ProtoMajor = 1
|
|
req.ProtoMinor = 1
|
|
if base == nil {
|
|
req.URL, err = ParseURL(url)
|
|
} else {
|
|
req.URL, err = base.ParseURL(url)
|
|
}
|
|
if err != nil {
|
|
break
|
|
}
|
|
url = req.URL.String()
|
|
if r, err = send(&req, c.Transport); err != nil {
|
|
break
|
|
}
|
|
if shouldRedirect(r.StatusCode) {
|
|
r.Body.Close()
|
|
if url = r.Header.Get("Location"); url == "" {
|
|
err = os.ErrorString(fmt.Sprintf("%d response missing Location header", r.StatusCode))
|
|
break
|
|
}
|
|
base = req.URL
|
|
continue
|
|
}
|
|
finalURL = url
|
|
return
|
|
}
|
|
|
|
err = &URLError{"Get", url, err}
|
|
return
|
|
}
|
|
|
|
// Post issues a POST to the specified URL.
|
|
//
|
|
// Caller should close r.Body when done reading from it.
|
|
//
|
|
// Post is a wrapper around DefaultClient.Post
|
|
func Post(url string, bodyType string, body io.Reader) (r *Response, err os.Error) {
|
|
return DefaultClient.Post(url, bodyType, body)
|
|
}
|
|
|
|
// Post issues a POST to the specified URL.
|
|
//
|
|
// Caller should close r.Body when done reading from it.
|
|
func (c *Client) Post(url string, bodyType string, body io.Reader) (r *Response, err os.Error) {
|
|
var req Request
|
|
req.Method = "POST"
|
|
req.ProtoMajor = 1
|
|
req.ProtoMinor = 1
|
|
req.Close = true
|
|
req.Body = nopCloser{body}
|
|
req.Header = Header{
|
|
"Content-Type": {bodyType},
|
|
}
|
|
req.TransferEncoding = []string{"chunked"}
|
|
|
|
req.URL, err = ParseURL(url)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return send(&req, c.Transport)
|
|
}
|
|
|
|
// PostForm issues a POST to the specified URL,
|
|
// with data's keys and values urlencoded as the request body.
|
|
//
|
|
// Caller should close r.Body when done reading from it.
|
|
//
|
|
// PostForm is a wrapper around DefaultClient.PostForm
|
|
func PostForm(url string, data map[string]string) (r *Response, err os.Error) {
|
|
return DefaultClient.PostForm(url, data)
|
|
}
|
|
|
|
// PostForm issues a POST to the specified URL,
|
|
// with data's keys and values urlencoded as the request body.
|
|
//
|
|
// Caller should close r.Body when done reading from it.
|
|
func (c *Client) PostForm(url string, data map[string]string) (r *Response, err os.Error) {
|
|
var req Request
|
|
req.Method = "POST"
|
|
req.ProtoMajor = 1
|
|
req.ProtoMinor = 1
|
|
req.Close = true
|
|
body := urlencode(data)
|
|
req.Body = nopCloser{body}
|
|
req.Header = Header{
|
|
"Content-Type": {"application/x-www-form-urlencoded"},
|
|
"Content-Length": {strconv.Itoa(body.Len())},
|
|
}
|
|
req.ContentLength = int64(body.Len())
|
|
|
|
req.URL, err = ParseURL(url)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return send(&req, c.Transport)
|
|
}
|
|
|
|
// TODO: remove this function when PostForm takes a multimap.
|
|
func urlencode(data map[string]string) (b *bytes.Buffer) {
|
|
m := make(map[string][]string, len(data))
|
|
for k, v := range data {
|
|
m[k] = []string{v}
|
|
}
|
|
return bytes.NewBuffer([]byte(EncodeQuery(m)))
|
|
}
|
|
|
|
// Head issues a HEAD to the specified URL.
|
|
//
|
|
// Head is a wrapper around DefaultClient.Head
|
|
func Head(url string) (r *Response, err os.Error) {
|
|
return DefaultClient.Head(url)
|
|
}
|
|
|
|
// Head issues a HEAD to the specified URL.
|
|
func (c *Client) Head(url string) (r *Response, err os.Error) {
|
|
var req Request
|
|
req.Method = "HEAD"
|
|
if req.URL, err = ParseURL(url); err != nil {
|
|
return
|
|
}
|
|
return send(&req, c.Transport)
|
|
}
|
|
|
|
type nopCloser struct {
|
|
io.Reader
|
|
}
|
|
|
|
func (nopCloser) Close() os.Error { return nil }
|