fix: make Authorization header check case-insensitive

[Louis454545]

Summary

Fixes #1043

This PR makes the Authorization header detection case-insensitive, which is the correct behavior according to HTTP RFC standards. Previously, the code only checked for the exact string 'Authorization' in headers, but HTTP headers should be case-insensitive.

Changes Made

• Replace case-sensitive 'Authorization' in this.headers check with case-insensitive Object.keys(this.headers).some(key => key.toLowerCase() === 'authorization')
• This allows headers like 'authorization', 'Authorization', 'AUTHORIZATION' to all work correctly

Testing

• All existing unit tests pass
• Build completes successfully
• Manual testing with various header case combinations (lowercase, uppercase, mixed case)
• Verified that no authorization header case still works correctly

Root Cause

The issue was introduced in the hasCustomAuthorizationHeader check which was meant to detect custom auth headers but was using case-sensitive string matching instead of proper case-insensitive header handling.

Additional Notes

This is a small but important fix that improves compatibility with various HTTP client implementations that may use different casing for the Authorization header.

🤖 Generated with Claude Code

Co-Authored-By: Claude [email protected]

[coveralls]

Pull Request Test Coverage Report for Build 16890387198

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 74.9%

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Totals
Change from base Build 16805913259:	0.1%
Covered Lines:	123
Relevant Lines:	147

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💛 - Coveralls

[mandarini]

Thank you for the contribution @Louis454545 !