Using jQuery to send a POST; server thinks GET

Question

Here is my javascript:

function sendAttack(attacker,defender,hpChange){
    USER_LAST_TIMESTAMP = Math.round(new Date().getTime() / 1000.0);
    var attack = new Attack(TURN_ID,attacker,defender,hpChange);
    attack.action_sequence = ACTION_QUEUE;
    var attackJSON = JSON.stringify(attack);
    jQuery.ajax({
        type: "POST",
        url: urlLeader + "attacks.json",
        data: attackJSON,
        success: function(data){
            ACTION_QUEUE++;
        }
    })  
}

In setup.js loaded prior to the above:

jQuery.ajaxSetup({
    accepts: 'application/json',
    dataType: 'jsonp'
});

This is what the server receives when I call that function:

2012-04-26T03:57:44+00:00 app[web.1]: Started GET "/attacks.json?callback=jQuery17103089843031743851_1335412646794&{%22attacker%22:2,%22defender%22:3,%22hp_change%22:6.799999999999997,%22action_sequence%22:0}&_=1335412659141" for 167.206.19.130 at 2012-04-26 03:57:44 +0000

Not the "GET". What's going on here?

First, have you tried to use different data as part of your post? Hard code a value, like data: "test=ing" or data: { test: 'ing'}. Second, are you using json2.js to enable "JSON.stringify" for browsers that don't natively support it? (see stackoverflow.com/questions/1480393/…) — Nick Bork
– Nick Bork, Commented Apr 26, 2012 at 4:15
You are omitting the dataType parameter in your request; jQuery may be changing your request type for you. — Cᴏʀʏ
– Cᴏʀʏ, Commented Apr 26, 2012 at 4:15
dataType is for the return value. It would be more likely if a "contentType" was specified to impact sending data to the server. Are you changing the jQuery AJAX defaults anywhere? — Nick Bork
– Nick Bork, Commented Apr 26, 2012 at 4:17
It seems you are sending JSON to the server in which case you need to set processData to false and set the appropriate Content-Type else JQuery tries to convert the data into application/x-www-form-urlencoded MIME type. — Suresh Kumar
– Suresh Kumar, Commented Apr 26, 2012 at 4:28
Default type is "GET". Try to complete jQuery.ajax function with semi-colon (;) and then check it once. There may be a problem with syntax on browsers. — Karthik
– Karthik, Commented Apr 26, 2012 at 4:44

oezi · Accepted Answer · 2012-04-26 08:19:37Z

2

maybe this forum post at jquery.com describes your problem:

Cross-domain JSONP requests are created by using a dynamic script tag, so they can only use a GET method.

answered Apr 26, 2012 at 8:19

oezi

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Alnitak · Accepted Answer · 2012-04-26 08:31:02Z

0

I suspect this block of jQuery code is responsible:

// Handle cache's special case and global
jQuery.ajaxPrefilter( "script", function( s ) {
    if ( s.cache === undefined ) {
        s.cache = false;
    }
    if ( s.crossDomain ) {
        s.type = "GET";
        s.global = false;
    }
});

i.e. a cross-domain script request (as used by JSONP) gets its type: field reset to GET.

This is because JSONP doesn't use XMLHTTPRequest at all, it fakes up a <script> tag and then your browser creates its own GET request to retrieve that resource.

edited Apr 26, 2012 at 8:31

answered Apr 26, 2012 at 8:25

Alnitak

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