Support Status Code in HTTP Response for WebSocket Handshake

[jjm159]

Description

I modified generateHttpResponseDueToError to accept errorCode and errorMessage, allowing the library user to determine the message included in the HTTP response status line.

Related Issue

#1423

How Has This Been Tested?

I implemented onWebsocketHandshakeReceivedAsServer and induced an error during the socket connection. I confirmed that the desired status code and message were added to the response status line.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.