10个重定向错误GoLang后，Wikipedia网址停止了

Upon executing an HTTP Get request, I receive the following error:

2015/08/30 16:42:09 Get https://en.wikipedia.org/wiki/List_of_S%26P_500_companies: 
stopped after 10 redirects

In the following code:

package main

import (
    "net/http"
    "log"
)

func main() {
    response, err := http.Get("https://en.wikipedia.org/wiki/List_of_S%26P_500_companies")
    if err != nil {
        log.Fatal(err)
    }
}

I know that according to the documentation,

// Get issues a GET to the specified URL. If the response is one of
// the following redirect codes, Get follows the redirect, up to a
// maximum of 10 redirects:
//
//    301 (Moved Permanently)
//    302 (Found)
//    303 (See Other)
//    307 (Temporary Redirect)
//
// An error is returned if there were too many redirects or if there
// was an HTTP protocol error. A non-2xx response doesn't cause an
// error.

I was hoping that somebody knows what the solution would be in this case. It seems rather odd that this simple url results in more than ten redirects. Makes me think that there may be more going on behind the scenes.

Thank you.

As others have pointed out, you should first give thought to why you are encountering so many HTTP redirects. Go's default policy of stopping at 10 redirects is reasonable. More than 10 redirects could mean you are in a redirect loop. That could be caused outside your code. It could be induced by something about your network configuration, proxy servers between you and the website, etc.

That said, if you really do need to change the default policy, you do not need to resort to editing the net/http source as someone suggested.

To change the default handling of redirects you will need to create a Client and set CheckRedirect.

For your reference: http://golang.org/pkg/net/http/#Client

// If CheckRedirect is nil, the Client uses its default policy,
// which is to stop after 10 consecutive requests.
CheckRedirect func(req *Request, via []*Request) error

I had this issue with Wikipedia URLs containing %26 because they redirect to a version of the URL with & which Go then encodes to %26 which Wikipedia redirects to & and ...

Oddly, removing gcc-go (v1.4) from my Arch box and replacing it with go (v1.5) has fixed the problem.

I'm guessing this can be put down to the changes in net/http between v1.4 and v1.5 then.