jQuery POST to a .NET HttpListener and back again
I have a chunk of javascript code that uses jQuery.post to send some data to a .NET app that's using an HttpListener.
Here's the js:
$.post("http://localhost:8080/catch", { name: "John", time: "2pm" },
function(data) {
alert(data);
});
and the C#:
HttpListenerContext context = listener.GetContext();
HttpListenerRequest request = context.Request;
StreamReader reader = new StreamReader(request.InputStream);
string s2 = reader.ReadToEnd();
Console.WriteLine("Data received:" + s2);
// Obtain a response object.
HttpListenerResponse response = context.Response;
// Construct a response.
string responseString = "<HTML><BODY> Hello world!</BODY></HTML>";
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(responseString);
// Get a response stream and write the response to it.
response.ContentLength64 = buffer.Length;
System.IO.Stream output = response.OutputStream;
output.Write(buffer, 0, buffer.Length);
// You must close the output stream.
output.Close();
The post request goes out ok, and the .NET app reads in the data ok, but the JS code doesn't seem to get the response. The callback function to the jQuery.post fires, but data is alway开发者_Go百科s undefined.For brevity I have omitted some C# above where I set the prefixes to the listener.
Any ideas why I'm not getting my data back client-side?
EDIT: I should add that when I run the JS with HttpFox running I get Http code 200, 'NS_ERROR_DOM_BAD_URI', which I thought had something to do with the "http://localhost:8080/catch" I was targeting, but when I hit that resource in firefox, i get the HTML response just fine and it registers as a GET, 200.
EDIT: I simplified the response to just 'meow', and this is what fiddler is giving me for the full response:
HTTP/1.1 200 OK
Content-Length: 4
Content-Type: text/html
Server: Microsoft-HTTPAPI/2.0
Date: Fri, 15 Apr 2011 12:58:49 GMT
meow
Don't forget about the same origin policy restriction. Unless your javascript is hosted on http://localhost:8080 you won't to be able to send AJAX requests to this URL. A different port number is not allowed either. You will need to host your javascript file on an HTML page served from http://localhost:8080 if you want this to work. Or have your server send JSONP but this works only with GET requests.
Remark: make sure you properly dispose disposable resource on your server by wrapping them in using statements or your server might start leaking network connection handles.
Don't forget to release the resources by closing the response.
Calling Close on the response will force the response to be sent through the underlying socket and will then Dispose all of its disposable objects.
In your example, the Close method is only called on the Output stream. This will send the response through the socket, but will not dispose any resources related to the response, which includes the output stream you referenced.
// Complete async GetContext and reference required objects
HttpListenerContext Context = Listener.EndGetContext(Result);
HttpListenerRequest Request = Context.Request;
HttpListenerResponse Response = Context.Response;
// Process the incoming request here
// Complete the request and release it's resources by call the Close method
Response.Close();
I do not see setting of content-type. Set the content-type to text/html.
response.ContentType = "text/html";
You can simplify the writing code a lot. Just use this:
// Construct a response.
string responseString = "<HTML><BODY> Hello world!</BODY></HTML>";
context.Response.Write(responseString);
No need for the OutputStream or most of that other code. If you do have a reason to use it, note that you actually should not close the OutputStream. When you use Resopnse.OutputStream you're retrieving a reference to it but you're not taking ownership. It's still owned by the Response object and will be closed properly when the Response is disposed at the end of the request.
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