Allow to properly PATCH methods with JDK11+

[Vo Kn]

Feature Request

This is a followup issue for #274

Description

Currently PATCH methods are silently transformed to POST methods.

However, in java 11+ (https://stackoverflow.com/a/64048579/922584) you can use the HttpRequest class to do what you want:

val request = HttpRequest.newBuilder()
               .uri(URI.create(uri))
               .method("PATCH", HttpRequest.BodyPublishers.ofString(message))
               .build()

Proposed Solution

It would be great if it was possible to leverage possibilities of JDK11+ and do correct PATCH requests as some services ignore the x-http-method-override header

[Kittinun Vantasin]

Sounds! Good, maybe it is a time for us to move to Java11 instead.

[Vo Kn]

I even tried to upgrade to HttpRequest myself, however the project does not build with current version of gradle/java and I couldn't even manage to run it :/

eg.:

Script compilation errors:

  Line 10:             if (requested.id.id == Android.libPlugin) {
                                              ^ Unresolved reference: Android

or

  Line 11:         Fuel.name,
                   ^ Unresolved reference: Fuel

  Line 12:         Fuel.Android.name,
                   ^ Unresolved reference: Fuel

  Line 13:         Fuel.Coroutines.name,
                   ^ Unresolved reference: Fuel

  Line 14:         Fuel.Forge.name,
                   ^ Unresolved reference: Fuel

  Line 15:         Fuel.Gson.name,
                   ^ Unresolved reference: Fuel

  Line 16:         Fuel.Jackson.name,
                   ^ Unresolved reference: Fuel

  Line 17:         Fuel.Json.name,
                   ^ Unresolved reference: Fuel

[Vo Kn]

For anyone who stumbles here – it can be hacked even without modifying current version of Fuel.

Two things need to be done:

1. Enable request.executionOptions.forceMethods = true
2. To allow for reflectively forcing PATCH to the string value on JDK11+, one must add JVM command line arguments: --add-opens java.base/sun.net.www.protocol.https=ALL-UNNAMED --add-opens java.base/java.net=ALL-UNNAMED