Support POSTing application-x-www-form-urlencoded Content-Type

[upgradingdave]

Description

Its currently not possible make a POST request and send data in the body with Content-Type of application/x-www-form-urlencoded.

The unqork api requires this and I think other folks can benefit from the ability as well.

The way I implemented this is that if there's a header set like this:

{
  "Content-Type": "application/x-www-form-urlencoded"
}

Then a body like this will be interpreted correctly:

{
  "grant_type":"password",
  "username":unqorkUsername,
  "password":unqorkPassword
}

Related issues

camunda-8-rest-connector-for-body-other-than-json

[sbuettner]

@upgradingdave Thanks for the contribution. Would you add a test (possibly using Wiremock) that demonstrates that the approach works? You can for example create one based on our e2e test suite: https://github.com/camunda/connectors/blob/main/connectors-e2e-test/connectors-e2e-test-http/src/test/java/io/camunda/connector/e2e/HttpTests.java#L97

Or inside the Connector project itself of course.

[sbuettner]

@johnBgood can we close this one as its covered by #2660

[johnBgood]

@sbuettner sure 💯

[sbuettner]

Closing this as it will be covered by the new REST Connector implementation.