php - AJAX FormData Post - 503 Service Unavailable -

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i've searched extensively on problem without avail or maybe i'm missing issue. please, relay me improve on explanation.

i have 'file' input calls php file using ajax on 'change' so:

$(document).on('change', 'input[name="photo"]', function(){          var file = this.files[0];         var formdata = new formdata();         var user = localstorage.getitem("user");          formdata.append('_file', file);         formdata.append('_user', user);          $.ajax({             type: "post",             cache: false,             url: ip + "php/insert_img.php",             data: formdata,             contenttype: false,             processdata: false,              success: function (e) {                 //             },             error: function (jqxhr, textstatus, errorthrown) {                 alert(textstatus, errorthrown);             }         });      });

this supposed phonegap app, , i'm using chrome's ripple emulator apache cordova/phonegap platform enabled testing.

now, works it's supposed when using localhost, , php prints formdata should, however, when use same php file uploaded server (hence 'ip' variable on ajax's url option), thats different story.

after sometime returns error setting , when checking chrome's developer tools > network tab, can see 'status code' of request is: 503 service unavailable. but, if change data setting other formdata(), works.

seems issue comes server settings, not aware of problem be.

i have experienced problem many of times when using ajax here initial thoughts:

is "ip" defined? url: ip + "php/insert_img.php"

also found removing of ajax options fixed issue. amended code below:

$(document).on('change', 'input[name="photo"]', function(){      var file = this.files[0];     var formdata = new formdata();     var user = localstorage.getitem("user");      formdata.append('_file', file);     formdata.append('_user', user);      $.ajax({         type: "post",         url: ip + "php/insert_img.php",         data: formdata,         success: function (e) {             //         },         error: function (jqxhr, textstatus, errorthrown) {             alert(textstatus, errorthrown);         }     });  });

hope helps.

---------- edit ----------

after bit of searching around, believe issue you're appending _file , _user data. if values of data array have "stringify" it:

formdata.append('_file', json.stringify(file)); formdata.append('_user', json.stringify(user));

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