Refactor: Change IndexData and IndexDataDump to POST

[jrhoads]

Purpose

This PR changes the HTTP method for the IndexData and IndexDataDump views from GET to POST. This change is made to align with the best practices for endpoints that perform write operations or trigger significant actions.

Approach

The GET method is generally used for retrieving data, while POST is more appropriate for operations that may alter server state or submit data. By changing these endpoints to POST, we ensure that their usage is consistent with their intended functionality.

Key Modifications

• Changed the HTTP method for IndexData view from GET to POST.
• Changed the HTTP method for IndexDataDump view from GET to POST.
• Updated unit tests to reflect the change in HTTP methods for both views.
• Added new tests for IndexData and IndexDataDump to verify authentication header handling when using POST.

Important Technical Details

• The change to POST for IndexData and IndexDataDump improves the semantic correctness of the API.
• The added tests ensure that the authentication mechanism correctly handles incoming POST requests with TOKEN and ROUTE_USER headers.

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)

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