http查询字符串：问号变为％3

Question

Attempting to append to an existing queryString, but '?' that proceeds the query string is being replaced with '%3'

 server := "server.com"
 endpoint:= "/buildWithParameters?token=<top_secret>" 

// concat server and build job
    u, err := url.Parse(server)
    u.Path = path.Join(u.Path, endpoint)
    endpoint := u.String()

    // since we are appending to existing querystring, request is needed for parsing
    req, err := http.NewRequest("POST", endpoint, nil)
    if err != nil {
        return fmt.Errorf("Error creating post request: (%v)", err)
    }

    // read existing query string
    q := req.URL.Query()


    q.Add("key", "value")

    req.URL.RawQuery = q.Encode()


    log.Println(req.URL.String())

The output is:

https://server.com/job/jobbyjob/buildWithParameters%3Ftoken=<top_secret>?key=value

Answer 1

That's because you're appending the query string to the path, so the library is correctly escaping ? to make for a valid URL. If you want token=<top_secret> to be treated as part of the query, you need to add it to the query instead:

endpoint:= "/buildWithParameters" 

// ... 

q.Add("token", "<top_secret>")