This little piece of code shows three problems I have encountered (and
solved, with varying levels of success) while using Go on App Engine.
endpoint, e := url.Parse(streamType)
if e != nil { return stream, t.New("Parsing for %s failed.", streamType) }
// endpoint.User = url.UserPassword(auth.Username, auth.Password)
client.Transport = &http.Transport {
Proxy : func(req *http.Request) (*url.URL, error) {
req.SetBasicAuth(auth.Username, auth.Password)
return nil, nil
},
}
if post {
resp, e = client.PostForm(endpoint.String(), options)
} else {
endpoint.RawQuery = options.Encode()
resp, e = client.Get(endpoint.String())
}
if e != nil { return stream, t.New("Could not fetch %s (%s): %v",
endpoint, options.Encode(), e) }
While URL’s that contain auth information are valid—like
http://user:[email protected]/ for example—the parser in Go’s net/url package
can’t handle them. (In fact, in the code, the logic for dealing with URLs
that have auth information is there, but the parsing of them fails
consistently miserably.) This is the case both in development and in
production.
My work-around, as you can see, was first to try to set the User attribute
of the URL object. But for POST requests, it is ignored. Since I will be
dealing with POST requests (as well as GET), I chose the option below it. I
created a fake proxy, whose only job was to enforce auth. It does it on the
Request object, which is never exposed anywhere at any point by the API.
The trick works.
Then another problem shows up, in that in development, the thing works
flawlessly, but in production it consistently returns permission denied.
This is provoked by the proxy—in that GAE doesn’t allow me to work the
proxy, even though that restriction is not documented explicity. When I
remove the proxy dance, it works.
I wonder how one can express Basic Authentication for a HTTP request
without running afoul of the gae gopher.
(This discussion system allows me to start a discussion *xor* ask a
question; I want to do both!)
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