Allow use of arbitrary HTTP method

[fuweichin]

Some web browsers (with Fetch API) support arbirary HTTP method except 'CONNECT'(reserved) and 'TRACE'(blocked in purpose), some web servers (with Servlet API) support arbirary HTTP method except 'CONNECT' (not implemented) and 'TRACE' (disabled by default).

The HTTP method select box of Postcode contains 7 options, I cannot use arbitrary HTTP methods which I can use with Fetch API, like WebDAV's methods, or custom methods.

To support input of arbitraty HTTP method, one approach is to make the select box editable, e.g. in HTML you can change something like <select name="method"> with <input type="text" name="method" datalist="httpMethods"><datalist id="httpMethods">.

B.T.W:

The RAW format select box of Postcode contains only 4 options, I cannot send arbitrary data formats (content types) which I can send with Fetch API, like 'application/csp-report'.

I'm a Postman user, nowdays Postman becomes unfriendly to my GPU, it comes with various issues: blackscreen/stuck, so I'm looking for a lightweight solution, maybe it's Postcode.