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POCORS with Dart, how do I get it to work?
 

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    <p>Just started tinkering with Dart and I decided to write a simple Http Server and a client. My server code:</p> <pre class="lang-dart prettyprint-override"><code>#import("dart:io"); final HOST = "127.0.0.1"; final PORT = 8080; final LOG_REQUESTS = true; void main() { HttpServer server = new HttpServer(); server.addRequestHandler((HttpRequest request) =&gt; true, requestReceivedHandler); server.listen(HOST, PORT); print("Server is running on ${PORT}."); } void requestReceivedHandler(HttpRequest request, HttpResponse response) { var pathname = request.uri; var apiresponse=""; if (LOG_REQUESTS) { print("Request: ${request.method} ${pathname}"); } if(pathname == '/api'){ response.headers.set(HttpHeaders.CONTENT_TYPE, "text/plain; charset=UTF-8"); response.headers.add("Access-Control-Allow-Methods", "POST, OPTIONS, GET"); response.headers.add("Access-Control-Allow-Origin", "*"); response.headers.add('Access-Control-Allow-Headers', '*'); print('welcome to the good life'); response.outputStream.writeString("API Call"); response.outputStream.close(); } } </code></pre> <p>My client code:</p> <pre class="lang-dart prettyprint-override"><code>#import('dart:html'); #import('dart:json'); class dartjson { dartjson() { } void run() { write("Hello World!"); } void fetchFeed(){ XMLHttpRequest xhr = new XMLHttpRequest(); var url = "http://127.0.0.1:8080/api"; xhr.open("GET", url, true); xhr.setRequestHeader('Content-Type', 'text/plain'); //xhr.setRequestHeader('Access-Control-Request-Headers', 'http://127.0.0.1:3030'); xhr.send(); print(xhr.responseText); document.query('#status').innerHTML = xhr.responseText; } void main() { new dartjson().fetchFeed(); } </code></pre> <p>I keep getting the error:</p> <pre class="lang-dart prettyprint-override"><code>XMLHttpRequest cannot load http://127.0.0.1:8080/api. Origin http://127.0.0.1:3030 is not allowed by Access-Control-Allow-Origin. </code></pre> <p>What I'm I doing wrong?</p>
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    1. USGünter Zöchbauer
    1. USjwesonga
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    1. COhave you seen those 2 links? http://blog.sethladd.com/2012/03/jsonp-with-dart.html https://groups.google.com/a/dartlang.org/group/misc/browse_thread/thread/e93a2b0e205bd5d1/605a7ef152f96e7b?lnk=gst&q=CORS#605a7ef152f96e7b
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      1. USGero
    2. CO`*` is not a valid value for anything except `Access-Control-Allow-Origin`; and it is not even valid for the origin field if the request is preflighted (which is the case if you uncomment the `Access-Control-Request-Headers` line - though it does not make much sense, the value should be a list of header names).
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    3. COI've got CORS working with the `Access-Control-Allow-Origin` property just the way you tried. Correct the other values and it should work fine.
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