blocks|key|242952|text|不要紧，我想通了--我在Header()上使用了Set()方法(哦！)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|242953|我的处理程序现在看起来像这样：|242954|func+saveHandler(w+http.ResponseWriter,+r+*http.Request)+{
++++//+allow+cross+domain+AJAX+requests
++++w.Header().Set("Access-Control-Allow-Origin",+"*")
}|code-block|syntax|javascript|242955|也许这会在某一天对像我这样缺乏咖啡因的人有所帮助:)|242956|entityMap^0|C|8|O|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

<p>Never mind, I figured it out - I used the <code>Set()</code> method on <code>Header()</code> (doh!)</p>

<p>My handler looks like this now:</p>

<pre><code>func saveHandler(w http.ResponseWriter, r *http.Request) {
    // allow cross domain AJAX requests
    w.Header().Set("Access-Control-Allow-Origin", "*")
}
</code></pre>

<p>Maybe this will help someone as caffeine deprived as myself sometime :)</p>


blocks|key|459847|text|我为这个例子创建了包装器：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|459848|func+addDefaultHeaders(fn+http.HandlerFunc)+http.HandlerFunc+{
++++return+func(w+http.ResponseWriter,+r+*http.Request)+{
++++++++w.Header().Set("Access-Control-Allow-Origin",+"*")
++++++++fn(w,+r)
++++}
}|code-block|syntax|javascript|459849|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>I create wrapper for this case:</p>

<pre><code>func addDefaultHeaders(fn http.HandlerFunc) http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        w.Header().Set("Access-Control-Allow-Origin", "*")
        fn(w, r)
    }
}
</code></pre>


blocks|key|242994|text|以上所有答案都是错误的，因为它们无法处理OPTIONS印前检查请求，解决方案是覆盖多路复用路由器的接口。请参阅AngularJS+$http+get+request+failed+with+custom+header+(alllowed+in+CORS)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|242995|func+main()+{
++++r+:=+mux.NewRouter()
++++r.HandleFunc("/save",+saveHandler)
++++http.Handle("/",+&MyServer{r})
++++http.ListenAndServe(":8080",+nil);

}

type+MyServer+struct+{
++++r+*mux.Router
}

func+(s+*MyServer)+ServeHTTP(rw+http.ResponseWriter,+req+*http.Request)+{
++++if+origin+:=+req.Header.Get("Origin");+origin+!=+""+{
++++++++rw.Header().Set("Access-Control-Allow-Origin",+origin)
++++++++rw.Header().Set("Access-Control-Allow-Methods",+"POST,+GET,+OPTIONS,+PUT,+DELETE")
++++++++rw.Header().Set("Access-Control-Allow-Headers",
++++++++++++"Accept,+Content-Type,+Content-Length,+Accept-Encoding,+X-CSRF-Token,+Authorization")
++++}
++++//+Stop+here+if+its+Preflighted+OPTIONS+request
++++if+req.Method+==+"OPTIONS"+{
++++++++return
++++}
++++//+Lets+Gorilla+work
++++s.r.ServeHTTP(rw,+req)
}|code-block|syntax|javascript|242996|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/22452804/angularjs-http-get-request-failed-with-custom-header-alllowed-in-cors^0|1J|20|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<p>All of the above answers are wrong because they fail to handle the OPTIONS preflight request, the solution is to override the mux router's interface. See <a href="https://stackoverflow.com/questions/22452804/angularjs-http-get-request-failed-with-custom-header-alllowed-in-cors">AngularJS $http get request failed with custom header (alllowed in CORS)</a></p>

<pre><code>func main() {
    r := mux.NewRouter()
    r.HandleFunc("/save", saveHandler)
    http.Handle("/", &amp;MyServer{r})
    http.ListenAndServe(":8080", nil);

}

type MyServer struct {
    r *mux.Router
}

func (s *MyServer) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
    if origin := req.Header.Get("Origin"); origin != "" {
        rw.Header().Set("Access-Control-Allow-Origin", origin)
        rw.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
        rw.Header().Set("Access-Control-Allow-Headers",
            "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
    }
    // Stop here if its Preflighted OPTIONS request
    if req.Method == "OPTIONS" {
        return
    }
    // Lets Gorilla work
    s.r.ServeHTTP(rw, req)
}
</code></pre>


blocks|key|459915|text|我遇到了上面描述的相同问题上面给出的解决方案是正确的，我的设置如下:+1)客户端的Angularjs+2)+GO服务器的Beego框架|type|unstyled|depth|inlineStyleRanges|entityRanges|data|459916|请遵循以下几点1)+CORS设置必须仅在GO服务器上启用2)请勿在angularJS中添加任何类型的标头|459917|.config(['$httpProvider',+function($httpProvider)+{
++++++++$httpProvider.defaults.useXDomain+=+true;
++++++++delete+$httpProvider.defaults.headers.common['X-Requested-With'];
++++}])|code-block|syntax|javascript|459918|在GO服务器中，在请求开始处理之前添加CORS设置，以便印前检查请求收到200OK，之后OPTIONS方法将转换为GET、POST、PUT或您的请求类型。|459919|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>I had the same issue as described above the solutions given above are correct, the set up I have is as follows
1) Angularjs for the Client 
2) Beego framework for GO server</p>

<p>Please following these points
1) CORS settings must be enabled only on GO server 
2) Do NOT add any type of headers in angularJS except for this </p>

<pre><code>.config(['$httpProvider', function($httpProvider) {
        $httpProvider.defaults.useXDomain = true;
        delete $httpProvider.defaults.headers.common['X-Requested-With'];
    }])
</code></pre>

<p>In you GO server add the CORS settings before the request starts to get processed so that the preflight request receives a 200 OK after which the the OPTIONS method will get converted to GET,POST,PUT or what ever is your request type.</p>


blocks|key|459954|text|设置一个合适的golang中间件，这样您就可以在任何端点上重用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|459955|Helper类型和函数|459956|type+Adapter+func(http.Handler)+http.Handler
//+Adapt+h+with+all+specified+adapters.
func+Adapt(h+http.Handler,+adapters+...Adapter)+http.Handler+{
++++for+_,+adapter+:=+range+adapters+{
++++++++h+=+adapter(h)
++++}
++++return+h
}|code-block|syntax|javascript|459957|实际的中间件|459958|func+EnableCORS()+Adapter+{
++++return+func(h+http.Handler)+http.Handler+{
++++++++return+http.HandlerFunc(func(w+http.ResponseWriter,+r+*http.Request)+{

++++++++++++if+origin+:=+r.Header.Get("Origin");+origin+!=+""+{
++++++++++++++++w.Header().Set("Access-Control-Allow-Origin",+origin)
++++++++++++++++w.Header().Set("Access-Control-Allow-Methods",+"POST,+GET,+OPTIONS,+PUT,+DELETE")
++++++++++++++++w.Header().Set("Access-Control-Allow-Headers",
++++++++++++++++++++"Accept,+Content-Type,+Content-Length,+Accept-Encoding,+X-CSRF-Token,+Authorization")
++++++++++++}
++++++++++++//+Stop+here+if+its+Preflighted+OPTIONS+request
++++++++++++if+r.Method+==+"OPTIONS"+{
++++++++++++++++return
++++++++++++}
++++++++++++h.ServeHTTP(w,+r)
++++++++})
++++}
}|459959|端点|459960|记住！中间件按相反顺序应用(+ExpectGET()首先触发)|459961|mux.Handle("/watcher/{action}/{device}",Adapt(api.SerialHandler(mux),
++++api.EnableCORS(),
++++api.ExpectGET(),
))|459962|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|11|8|@]|9|@]|A|$G|H]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

<p>Set a proper golang middleware, so you can reuse on any endpoint.</p>

<h2>Helper Type and Function</h2>

<pre><code>type Adapter func(http.Handler) http.Handler
// Adapt h with all specified adapters.
func Adapt(h http.Handler, adapters ...Adapter) http.Handler {
    for _, adapter := range adapters {
        h = adapter(h)
    }
    return h
}
</code></pre>

<h2>Actual middleware</h2>

<pre><code>func EnableCORS() Adapter {
    return func(h http.Handler) http.Handler {
        return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

            if origin := r.Header.Get("Origin"); origin != "" {
                w.Header().Set("Access-Control-Allow-Origin", origin)
                w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
                w.Header().Set("Access-Control-Allow-Headers",
                    "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
            }
            // Stop here if its Preflighted OPTIONS request
            if r.Method == "OPTIONS" {
                return
            }
            h.ServeHTTP(w, r)
        })
    }
}
</code></pre>

<h2>Endpoint</h2>

<h3>REMEBER! Middlewares get applyed on reverse order( ExpectGET() gets fires first)</h3>

<pre><code>mux.Handle("/watcher/{action}/{device}",Adapt(api.SerialHandler(mux),
    api.EnableCORS(),
    api.ExpectGET(),
))
</code></pre>


<p>I'm trying to set a header in my Go web server. I'm using <code>gorilla/mux</code> and <code>net/http</code> packages.</p>

<p>I'd like to set <code>Access-Control-Allow-Origin: *</code> to allow cross domain AJAX.</p>

<p>Here's my Go code:</p>

<pre><code>func saveHandler(w http.ResponseWriter, r *http.Request) {
// do some stuff with the request data
}

func main() {
    r := mux.NewRouter()
    r.HandleFunc("/save", saveHandler)
    http.Handle("/", r)
    http.ListenAndServe(":"+port, nil)
}
</code></pre>

<p>The <code>net/http</code> package has documentation describing sending http request headers as if it were a client - I'm not exactly sure how to set response headers?</p>


Setting HTTP headers

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我正在尝试在我的Go web服务器中设置一个头文件。我使用的是gorilla/mux和net/http包。我想将Access-Control-Allow-Origin: *设置为允许跨域AJAX。这是我的Go代码：func saveHandler(w http.ResponseWriter, r *http.Reque...

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