Query URL without redirect in Go

I am writing a benchmark test for a redirect script.

I wisg my program to query certain URL that redirects to AppStore. But I do not wish to download AppStore page. I just wish to log redirect URL or error.

How do I tell Go to query URL without second redirect query?

UPDATE

Both answers are correct BUT:

I tried both solutions. I am doing benchmarking.
I run 1 or many go processes with 10 - 500 go routines. They query URL in a loop.
My server is also written in go. It reports number of requests every second.

• First solution: http.DefaultTransport.RoundTrip - works slow, gives errors.
  First 4 seconds works fine. Making 300-500 queries then performance drops to 80 query per second.

Then drops to 0-5 query per second and queryies script start getting errors like

dial tcp IP:80: A connection attempt failed because the connected 
party did not properly respond after a period of time, or established 
connection failed because connected host has failed to respond.

I guess it re-use connection that is closed.

• Second solution: CheckRedirect field works with constant performance. I am not sure if it re-uses connections or it opens a new connection for every request. I create client for every request in a loop. It is how it will behave in a real life (every request is a new connection). Is there way to ensure that connections are closed after each query and not re-used?

That is why I am going to mark second solution as such that answer my question. But for my research it is very important that each query was a new connection. How can I ensure with second solution?

You need to use an http.Transport instead of an http.Client. Transport is lower-level and does not follow redirects.

req, err := http.NewRequest("GET", "http://example.com/redirectToAppStore", nil)
// ...
resp, err := http.DefaultTransport.RoundTrip(req)

For completeness' sake, you can use an http.Client and not follow redirects. http.Client has a CheckRedirect field which is a function. It is called before following any redirection.

If this function returns an error, then httpClient.Do(...) will not follow the redirect (see doFollowingRedirects() function in Go's source code) and instead will return an error (its concrete type will be url.Error, and its URL field will be the redirect-to URL, aka the Location header value, see this code).

You can see my gocrawl library for a concrete example of this use.