Getting EOF error response when doing HEAD request

I am trying to do a HEAD request at "https://speed.hetzner.de/100MB.bin" to get the metadata of the file. I am served with an EOF error response. However, the GET request is successful for the same URL.

What could be the possible reasons?

I suspect that the server has blocked HEAD requests, but how do I verify it?

PS: adding the code:

func BuildRequest(method string, url string) (*http.Request, error) {
	r, err := http.NewRequest(method, url, nil)
	r.Header.Set("User-Agent", "my app")
	return r, err
}

func (m *FileMeta) Fetch(url string) error {
	r, err := BuildRequest(http.MethodHead, url)
	if err != nil {
		return err
	}

	resp, err := HTTPClient().Do(r)

	if err != nil {
		return err
	}

	defer resp.Body.Close()
}

Error screenshot:

You haven't shown us any code ...

...but sounds like you're trying to read an HTTP "response" from a HEAD request (instead of only accessing the HTTP response headers).

Per the RFC:

> https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.4
>
> The HEAD method is identical to GET except that the server MUST NOT
> return a message-body in the response. The metainformation contained
> in the HTTP headers in response to a HEAD request SHOULD be identical
> to the information sent in response to a GET request. This method can
> be used for obtaining metainformation about the entity implied by the
> request without transferring the entity-body itself. This method is
> often used for testing hypertext links for validity, accessibility,
> and recent modification.

In other words, the response to a HEAD request doesn't have a body. If you try to read one, you'll get an EOF. I suspect that's what's happening here.

Thank you for updating your question with this code. It looks like you're using Go.

Try this:

res, err := http.Head("https://golang.org")
if err != nil {
    panic(err)
}
println(res.StatusCode)

And remember: res will have no Body.

ADDENDUM

– Rajesh Sethi
> I did try with Postman, it didn't respond with HEADER information.
> I tried Curl, it says "Empty reply from server".
>
> The code above, resp, err := http.Head("speed.hetzner.de/100MB.bin"), throws the same "EOF" error.

– paulsm4

> Cool - thank you. So it sounds like your original surmise is correct:
> 1) Your code is OK: you're not "doing anything wrong" (like trying to read a "Body" that isn't there).
>
> 2) Rather, that particular URL
> (speed.hetzner.de) is blocking (or at least refusing to process) HEAD requests.