2014-03-12 20:38
浏览 209


So I've got this Go http handler that stores some POST content into the datastore and retrieves some other info in response. On the back-end I use:

func handleMessageQueue(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Access-Control-Allow-Origin", "*")
    if r.Method == "POST" {

        c := appengine.NewContext(r)

        body, _ := ioutil.ReadAll(r.Body)

        auth := string(body[:])
        q := datastore.NewQuery("Message").Order("-Date")

        var msg []Message
        key, err := q.GetAll(c, &msg)

        if err != nil {
            c.Errorf("fetching msg: %v", err)

        w.Header().Set("Content-Type", "application/json")
        jsonMsg, err := json.Marshal(msg)
        msgstr := string(jsonMsg)
        fmt.Fprint(w, msgstr)

In my firefox OS app I use:

var message = "content";

request = new XMLHttpRequest();
request.open('POST', 'http://localhost:8080/msgs', true);

request.onload = function () {
    if (request.status >= 200 && request.status < 400) {
        // Success!
        data = JSON.parse(request.responseText);
    } else {
        // We reached our target server, but it returned an error
        console.log("server error");

request.onerror = function () {
    // There was a connection error of some sort
    console.log("connection error");


The incoming part all works along and such. However, my response is getting blocked. Giving me the following message:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:8080/msgs. This can be fixed by moving the resource to the same domain or enabling CORS.

I tried a lot of other things but there is no way I can just get a response from the server. However when I change my Go POST method into GET and access the page through the browser I get the data that I want so bad. I can't really decide which side goes wrong and why: it might be that Go shouldn't block these kinds of requests, but it also might be that my javascript is illegal.

  • 点赞
  • 写回答
  • 关注问题
  • 收藏
  • 邀请回答

3条回答 默认 最新

  • dsdtszi0520538 2014-03-13 22:11

    @Egidius, when creating an XMLHttpRequest, you should use

    var xhr = new XMLHttpRequest({mozSystem: true});

    What is mozSystem?

    mozSystem Boolean: Setting this flag to true allows making cross-site connections without requiring the server to opt-in using CORS. Requires setting mozAnon: true, i.e. this can't be combined with sending cookies or other user credentials. This only works in privileged (reviewed) apps; it does not work on arbitrary webpages loaded in Firefox.

    Changes to your Manifest

    On your manifest, do not forget to include this line on your permissions:

    "permissions": {
           "systemXHR" : {},
    点赞 评论
  • duanli0687 2014-03-13 03:03

    You need other headers, not only access-control-allow-origin. If your request have the "Access-Control-Allow-Origin" header, you must copy it into the response headers, If doesn't, you must check the "Origin" header and copy it into the response. If your request doesn't have Access-Control-Allow-Origin not Origin headers, you must return "*".

    You can read the complete explanation here: http://www.html5rocks.com/en/tutorials/cors/#toc-adding-cors-support-to-the-server

    and this is the function I'm using to write cross domain headers:

    func writeCrossDomainHeaders(w http.ResponseWriter, req *http.Request) {
        // Cross domain headers
        if acrh, ok := req.Header["Access-Control-Request-Headers"]; ok {
            w.Header().Set("Access-Control-Allow-Headers", acrh[0])
        w.Header().Set("Access-Control-Allow-Credentials", "True")
        if acao, ok := req.Header["Access-Control-Allow-Origin"]; ok {
            w.Header().Set("Access-Control-Allow-Origin", acao[0])
        } else {
            if _, oko := req.Header["Origin"]; oko {
                w.Header().Set("Access-Control-Allow-Origin", req.Header["Origin"][0])
            } else {
                w.Header().Set("Access-Control-Allow-Origin", "*")
        w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE")
        w.Header().Set("Connection", "Close")
    点赞 评论
  • doumeng3188 2019-05-29 07:16

    You have to placed this code in application.rb

    config.action_dispatch.default_headers = {
            'Access-Control-Allow-Origin' => '*',
            'Access-Control-Request-Method' => %w{GET POST OPTIONS}.join(",")
    点赞 评论

相关推荐 更多相似问题