HTTP PATCH support in browsers

Solution 1:

HTTP/1.1 did not define the PATCH method.

HTTP/1.1 does leave itself open for clients and/or servers to add new methods.

RFC 5789 defined the conventions for using the PATCH method.

The method defined within a HTTP request is nothing more than a string. Browsers should allow JavaScript to use whatever HTTP method it wants in the XmlHttpRequest; see this Q&A for more info. In short, any modern browser will allow you to do this, i.e. IE9+ and Firefox/Chrome/Safari/Opera/Spartan from the last few years.

Also, don't forget the server needs to specifically handle the PATCH method too, it doesn't just magically happen.