Resolved mismatch stubbings in HttpContentServiceImplTest.java

[ARMS2025]

I analyzed the test doubles (mocks) in the test code of the project. In my analysis of the project, I observed that

In tests testPostFormNoParams, testGetForm, and testGetFormNoParams:

• the getParameter method for the request object:
  i) during test execution the method is actually called with argument "proxy.url", but is not stubbed, resulting in mismatch stubbings.

In the test testNonForm:

• the getParameter method for the request object:
  i) during test execution the method is actually called with argument "proxy.url", but is not stubbed, resulting in a mismatch stubbing.
  ii) during test execution the method is actually called with argument "proxy.formMethod", but is not stubbed, resulting in another mismatch stubbing.

In general, a mismatched stubbing occurs when a method is stubbed with specific arguments in a test but later invoked with different arguments in the code. Mockito recommends addressing this type of issue (https://www.javadoc.io/doc/org.mockito/mockito-core/latest/org.mockito/org/mockito/exceptions/misusing/PotentialStubbingProblem.html).

I propose a solution below to resolve the mismatch stubbing. Happy to modify the pull request based on your feedback.