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Still confused using cross-domain XMLHTTPRequest

I need to send POST data to a server in another domain. This server uses SSL and expects the data to be in the form of a JSON string. I am trying to do this from javascript.

I am creating data and using JSON.stringify () to get it in the correct format. Then I send it as follows:

var url = "https://api.postageapp.com/v.1.0/send_message.json"; http=new XMLHttpRequest(); http.open("POST", url, true); http.setRequestHeader("Content-type", "application/json"); http.setRequestHeader("Connection", "close"); // create the data in a data structure named post_data var JSONText = JSON.stringify(post_data); http.send(JSONText);

Perform packet tracing. I see that my client is shaking hands with the server, but then the server twice responds with an “Encrypted alert”, including the last time it sends a packet back. The browser debugger always shows error 405 - Method Now Allowed.

What am I missing to get this to work? When they try it in their domain, it works fine.

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3 answers

You need the server to return the HTTP header as follows:

 header('Access-Control-Allow-Origin: *');

Live example: Making JavaScript requests for cross-domains using XMLHttpRequest or XDomainRequest

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You cannot cross-domain a message like this.

An alternative is to use a server proxy (read this link to get a good explanation of why you cannot do this) or an iframe approach .

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Strictly speaking, this should not be possible (due to security issues), however, using the JSONP workaround, you can achieve this using the RESTful web service.

See the link below. http://en.wikipedia.org/wiki/JSONP

MS has some code that you can download somewhere on the Internet with specific associations that the code invokes.

  • JSONPBehaviour.cs
  • JSONPBindingElement.cs
  • JSONPBindingExtension.cs
  • JSONPEncoderFactory.cs
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