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POHttp Redirect in Web Socket Connection [now better explained]
 

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    <p>I think my original question (see below the bar) was too vague. I have made up the following silly example that shows what is my point.</p> <pre><code>package main import ( "fmt" "net/http" "time" ) func main() { http.HandleFunc("/redir", redirHandler) http.HandleFunc("/", rootHandler) _ = http.ListenAndServe("localhost:4000", nil) } func redirHandler(w http.ResponseWriter, r *http.Request) { fmt.Fprint(w, "hello, this is redir which will host the foreign html page") } func rootHandler(w http.ResponseWriter, r *http.Request) { fmt.Fprint(w, "hello, this is root") // at some point "foreign webserver" sends me a complete // html page. // I want to serve this page at "/redir/", and I feel my // best shot is to redirect to "/redir" time.Sleep(2 * time.Second) http.Redirect(w, r, "/redir/", http.StatusFound) } </code></pre> <p>This code does not work, as I cannot re-use w to perform the re-direct. So, is it possible to redirect in this case, for example by means of another http package call?</p> <p>I hope I've made myself clear...</p> <p>Thanks in advance</p> <p>Chris</p> <hr> <p>I am working on "my server" in the following configuration</p> <pre><code>[web browser client] -- [my server] -- [foreign webservice] </code></pre> <p>"my server" provides the following to "web browser client"</p> <pre><code>func main() { http.HandleFunc("/launch", launchHandler) http.HandleFunc("/", rootHandler) http.Handle("/socket", websocket.Handler(socketHandler)) err := http.ListenAndServe(listenAddr, nil) if err != nil { log.Fatal(err) } } </code></pre> <p>RootHandler writes an html page to "web browser client", and socketHandler establishes a websocket connection between "web browser client" and "my server".</p> <p>Requests from "web browser client" arrive over the web socket connection and are handled by "my server", "my server" communicates with "foreign webservice" to determine the response.</p> <p>Usually, "foreign webservice" gives a little bit of data which is used by "my server" to respond to "web browser client".</p> <p>In some occasions, "foreign webservice" responds with a complete html page.</p> <p>I am not sure how to communicate such html page to "web browser client"</p> <p>My best guess so far is to execute a http.Redirect() to launchHandler such that launchHandler can write the html page as obtained from "foreign web server" to "web browser client". (It is no problem when the web socket connection is closed.)</p> <p>In order to do so, I use the http.ResponseWriter, *http.Request as parameters to httpRedirect which were received in rootHandler in the first place.</p> <p>This does not work and produced log message: "http: multiple response.WriteHeader calls"</p> <p>Any suggestions on how to fix this? Maybe my approach to perform a http.Redirect is wrong; Maybe I should obtain an other http.ResponseWriter and/or *http.Request values.</p> <p>Any help is appreciated!</p>
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    1. COGiven the lack of responses so far, you might need to provide the actual code which results in this problem. I confess I'm a little confused as to what you're trying to achieve based on your description.
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      1. USRich Churcher
 

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