HEAD responses with application/json results parseerror

[julio.melo+jquery@…]

Using ajax to fetch an URL using request type HEAD leads to parseerror when content-type is application/json on response. Using GET, it worked as expected.

According to RF2616, section 10.2.1 "HEAD the entity-header fields corresponding to the requested resource are sent in the response without any message-body". When the type of request is HEAD, jQuery should accept empty response, even when content-type is defined as application/json.

This fails $.ajax({

url : "​http://ip.jsontest.com/", type : "HEAD", success : function() { console.log("HEAD OK!"); }, error : function() { console.error("HEAD Failed!"); }

});

This is ok $.ajax({

url : "​http://ip.jsontest.com/", type : "GET", success : function() { console.log("GET OK!"); }, error : function() { console.error("GET Failed!"); }

});

[dmethvin]

It does seem like we shouldn't be parsing content on HEAD requests since no data is ever expected. This is a bit different than #13450 where the browser sets a content-type but has a content-length of 0 for a request that should return data.

[jaubourg]

(Well, it's tempting to special case HEAD requests here but isn't the fact the server delivers a response to a HEAD request with an actual content-type the real issue here ? If there is not content, why is the server providing a content-type ?)

Scrap that, this IS a bug. The HEAD request is supposed to have the same headers as the GET request. It's getting late here ;)

[Julian Aubourg]

Handles HEAD requests as if they always were 204. Fixes #13922.

Changeset: a2cd89a795067d67d8212a4571991e5d2fb0ea8f