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http: Client.Do should follow redirects for GET and HEAD

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It's documented as such, but it was never wired up
after Transport went in and Head was fixed.

If people don't want redirects, that's what RoundTripper/
Transport are for.  Or a custom redirect policy.

R=golang-dev, kevlar
CC=golang-dev
https://golang.org/cl/4526065
This commit is contained in:
Brad Fitzpatrick 2011-05-18 17:17:26 -07:00
parent 1d550bdedf
commit 4ffff35abd
2 changed files with 44 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
src/pkg/http/client.go
View File

@ -74,6 +74,9 @@ type readClose struct {
//
// Generally Get, Post, or PostForm will be used instead of Do.
func (c *Client) Do(req *Request) (resp *Response, err os.Error) {
if req.Method == "GET" || req.Method == "HEAD" {
return c.doFollowingRedirects(req)
}
return send(req, c.Transport)
}
@ -144,10 +147,14 @@ func Get(url string) (r *Response, err os.Error) {
//
// Caller should close r.Body when done reading from it.
func (c *Client) Get(url string) (r *Response, err os.Error) {
return c.sendFollowingRedirects("GET", url)
req, err := NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
return c.doFollowingRedirects(req)
}
func (c *Client) sendFollowingRedirects(method, url string) (r *Response, err os.Error) {
func (c *Client) doFollowingRedirects(ireq *Request) (r *Response, err os.Error) {
// TODO: if/when we add cookie support, the redirected request shouldn't
// necessarily supply the same cookies as the original.
var base *URL
@ -157,33 +164,33 @@ func (c *Client) sendFollowingRedirects(method, url string) (r *Response, err os
}
var via []*Request
req := ireq
url := "" // next relative or absolute URL to fetch (after first request)
for redirect := 0; ; redirect++ {
var req Request
req.Method = method
req.Header = make(Header)
if base == nil {
req.URL, err = ParseURL(url)
} else {
if redirect != 0 {
req = new(Request)
req.Method = ireq.Method
req.Header = make(Header)
req.URL, err = base.ParseURL(url)
}
if err != nil {
break
}
if len(via) > 0 {
// Add the Referer header.
lastReq := via[len(via)-1]
if lastReq.URL.Scheme != "https" {
req.Referer = lastReq.URL.String()
}
err = redirectChecker(&req, via)
if err != nil {
break
}
if len(via) > 0 {
// Add the Referer header.
lastReq := via[len(via)-1]
if lastReq.URL.Scheme != "https" {
req.Referer = lastReq.URL.String()
}
err = redirectChecker(req, via)
if err != nil {
break
}
}
}
url = req.URL.String()
if r, err = send(&req, c.Transport); err != nil {
if r, err = send(req, c.Transport); err != nil {
break
}
if shouldRedirect(r.StatusCode) {
@ -193,12 +200,13 @@ func (c *Client) sendFollowingRedirects(method, url string) (r *Response, err os
break
}
base = req.URL
via = append(via, &req)
via = append(via, req)
continue
}
return
}
method := ireq.Method
err = &URLError{method[0:1] + strings.ToLower(method[1:]), url, err}
return
}
@ -310,5 +318,9 @@ func Head(url string) (r *Response, err os.Error) {
// 303 (See Other)
// 307 (Temporary Redirect)
func (c *Client) Head(url string) (r *Response, err os.Error) {
return c.sendFollowingRedirects("HEAD", url)
req, err := NewRequest("HEAD", url, nil)
if err != nil {
return nil, err
}
return c.doFollowingRedirects(req)
}

11
src/pkg/http/client_test.go
View File

@ -98,13 +98,20 @@ func TestRedirects(t *testing.T) {
c := &Client{}
_, err := c.Get(ts.URL)
if e, g := "Get /?n=10: stopped after 10 redirects", fmt.Sprintf("%v", err); e != g {
t.Errorf("with default client, expected error %q, got %q", e, g)
t.Errorf("with default client Get, expected error %q, got %q", e, g)
}
// HEAD request should also have the ability to follow redirects.
_, err = c.Head(ts.URL)
if e, g := "Head /?n=10: stopped after 10 redirects", fmt.Sprintf("%v", err); e != g {
t.Errorf("with default client, expected error %q, got %q", e, g)
t.Errorf("with default client Head, expected error %q, got %q", e, g)
}
// Do should also follow redirects.
greq, _ := NewRequest("GET", ts.URL, nil)
_, err = c.Do(greq)
if e, g := "Get /?n=10: stopped after 10 redirects", fmt.Sprintf("%v", err); e != g {
t.Errorf("with default client Do, expected error %q, got %q", e, g)
}
var checkErr os.Error