去正确处理切片和字符串

Question

I am using goRequest http://parnurzeal.github.io/gorequest/ to make some HTTP requests against a server process I need to talk to. The authentication process works like this;

send in a GET request with an authentication header set. No problem there, but I need to grab a header from the response and use a returned value to reauthenticate each following request.

The retuned HTTP header looks like this.

Response headers
map[Location:[900767244] Content-Type:[application/xml] Date:[Fri, 18     Sep 2015 18:19:41 GMT] Server:[Apache] X-Frame-Options:[SAMEORIGIN] Set-Cookie:[JSESSIONID=D5C976F5646365FF030DBAD770DA774C; Path=/; Secure; HttpOnly]]

I need to get that location value as it's my session token going forward. If I grap it like this:

session, ok := response.Header["Location"]
if !ok {
    fmt.Println("Did not receive a location header.")
}

fmt.Println("Session: ", session)

I can get it, but it's a slice and NOT a string. How can I get that value as a string so I can pop it back into my request headers going forward? As you can see in the following error:

./login.go:133: cannot use session (type []string) as type string in argument to logoutRequest.Delete

Thanks a lot! Craig

Answer 1

If you want one value, use the Header's Get method

location := response.Header.Get("Location")

This also canonicalizes the header name for you, so that you still get a value even when using slightly different capitalization.

You only need to index an http.Header value directly when you need to get more than than the first possible value. If you want all values with a canonicalized header name, you can use textproto.CanonicalMIMEHeaderKey

vals := response.Header[textproto.CanonicalMIMEHeaderKey(header)]