Fix DeepL API auth to use Authorization header instead of legacy query/body params by markruler · Pull Request #815

Fix DeepL API auth to use Authorization header instead of legacy query/body params by markruler · Pull Request #815 · bbepis/XUnity.AutoTranslator

Pull request overview

This PR migrates the DeepL Legitimate (authenticated) translation endpoint from the deprecated auth_key query/body parameter authentication to the required Authorization: DeepL-Auth-Key header method, as mandated by DeepL's January 15, 2026 deprecation of legacy auth methods (issue #803).

Changes:

Removed auth_key from URL templates and form body parameters
Added Authorization header with DeepL-Auth-Key scheme to HTTP requests
Switched from PostAsync (which created a redundant, unused HttpRequestMessage) to SendAsync using the properly configured request object

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