Jquery ajax在Phonegap中调用RESTful API

Question

I'm trying to make a RESTful api call from the android emulator (using android 2.2). On my server for the login request I'm setting the cors header response.setHeader("Access-Control-Allow-Origin", "*");

This exact code works fine from Firefox 4 and Chrome 10 and I was led to believe the android browser resolves this header from version 2.1 up .

usr = $("#email").val();
pwd = $("#password").val();

$.ajax({
    url: "http://myremoteserver/login",
    data: {"username": escape(usr), "password": escape(pwd)},
    dataType: "json",
    headers: {"Accept": "application/json"},
    success: function(response) {
      console.log("Success: " + response);
      if (response.result == "success") {
        //doStuff
      }
      else {
        console.log("Success Error: " + response);
        $("#error").html(response);
      }
    },
    error: function(request, status, error) {
      console.log("Error status " + status);
      console.log("Error request status text: " + request.statusText);
      console.log("Error request status: " + request.status);
      console.log("Error request response text: " + request.responseText);
      console.log("Error response header: " + request.getAllResponseHeaders());
      $("#error").html(status);
    }

});

The server never receives the request and the status code is 0 which I've read can mean a cross scripting error. But, as I've said, it works fine in modern browsers.

These are the pertinent logs I see in the LogCat

03-29 20:30:46.935: DEBUG/PhoneGapLog(277): file:///android_asset/www/index.html: Line 36 : Error status error
03-29 20:30:46.935: INFO/Web Console(277): Error status error at file:///android_asset/www/index.html:36
03-29 20:30:46.954: DEBUG/PhoneGapLog(277): file:///android_asset/www/index.html: Line 37 : Error request status text: error
03-29 20:30:46.954: INFO/Web Console(277): Error request status text: error at file:///android_asset/www/index.html:37
03-29 20:30:46.985: DEBUG/PhoneGapLog(277): file:///android_asset/www/index.html: Line 38 : Error request status: 0
03-29 20:30:46.985: INFO/Web Console(277): Error request status: 0 at file:///android_asset/www/index.html:38
03-29 20:30:47.003: DEBUG/PhoneGapLog(277): file:///android_asset/www/index.html: Line 39 : Error request response text: 
03-29 20:30:47.003: INFO/Web Console(277): Error request response text:  at file:///android_asset/www/index.html:39
03-29 20:30:47.034: DEBUG/PhoneGapLog(277): file:///android_asset/www/index.html: Line 40 : Error response header: 
03-29 20:30:47.034: INFO/Web Console(277): Error response header:  at file:///android_asset/www/index.html:40
03-29 20:33:38.704: DEBUG/SntpClient(65): request time failed: java.net.SocketException: Address family not supported by protocol

As you can see there isn't a whole lot there... makes it a pain to try to debug anything.

Edit: AndroidManifest.xml permissions

  <uses-permission android:name="android.permission.CAMERA" />
  <uses-permission android:name="android.permission.VIBRATE" />
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
  <uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
  <uses-permission android:name="android.permission.READ_PHONE_STATE" />
  <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.RECEIVE_SMS" />
  <uses-permission android:name="android.permission.RECORD_AUDIO" />
  <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
  <uses-permission android:name="android.permission.READ_CONTACTS" />
  <uses-permission android:name="android.permission.WRITE_CONTACTS" />
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Answer 1

This was caused by the android emulator not being able to connect to the internet. It was fixed by adding -dns-server XXXX (where XXXX is my dns server) to the "Default emulator options" in the Android preferences in eclipse.

Answer 2

As you mentioned you are calling RESTful API for login service, I think you need to specify the ajax type to be POST method because it is GET method in default. ie,

$.ajax({ type: 'POST', ... });

I think that is why server is not returning any response.

If this does not fix your problem, could you tell me if you can successfully access other web services (anything on the web) from the application?