Re: GWT2.0: POST request for some reasnos converted to OPTIONS in new hosted mode

On Dec 21, 4:00 pm, Mike Chaliy <m...@chaliy.name> wrote:
> My application in hosed mode (http://localhost:8888) send plain HTTP
> POST requests for example to thehttp://localhost/Inventory/.
>
> After upgrade from GWT1.7 to GWT2.0, all POST requests are now sent as
> OPTIONS request.
>
> Method:                 OPTIONS
> Host:           localhost
> User-Agent:     Mozilla/5.0 (Windows; U; Windows NT 6.1; uk; rv:1.9.1.6)
> Gecko/20091201 Firefox/3.5.6
> Accept:         text/html,application/xhtml+xml,application/xml;q=0.9,*/
> *;q=0.8
> Keep-Alive:     300
> Connection:     keep-alive
> Origin:        http://localhost:8888
> Access-Control-Request-Method:  POST
>
> So the querstions are:
>
> 1. Why GWT do so?

GWT doesn't do anything here (even less in GWT 2.0 with DevMode than
in previous versions where the browser was embedded into GWTShell/
HostedMode)

> 2. How to disable this?
>
> May be this is because of "same origin policy" issue?

Exactly: Firefox 3.5 supports "CORS" which allows cross-origin
requests under certain conditions. One of these is to first ask the
server if it accepts such cross-origin requests (instead of just
failing without even attempting a request, as previous Firefox
versions did), and this is done with an OPTIONS request containing an
Origin and Access-Control-Request-Method request headers. You're just
seeing this "preflight" request. This not a bug, neither in GWT nor in
Firefox; maybe in you code, as it means you're using absolute
references in requests ("http://blablabalbla"), which are likely to
break in most browsers (Firefox 3.0 and previous versions, Internet
Explorer –IE8 uses an XDomainRequest for CORS-like functionnality,
instead of XMLHttpRequest–, Safari, Opera 9.x, etc.)
Same goes for other browsers (last versions of Chrome and Opera
support it AFAICT), as CORS is a being developped at the W3C.

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