Fix Gmail OAuth token exchange behind TLS proxy - #710
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Gmail reauthorisation behind the DGX TLS-terminating tunnel reached Google, then failed during token exchange because Flask supplied an internal HTTP callback URL. Build the authorisation response from the same configured/start-bound callback used by the OAuth flow, preserving its encoded provider query. This keeps OAuthlib HTTPS validation enabled and avoids using incoming host/forwarded headers to select the response origin.
Validated with 13 targeted OAuth service/route tests, including a new regression using OAuthlib’s real HTTPS and query parser. Existing local callback and PKCE route tests pass; formatting and diff checks pass. Live Google consent and Gmail access verification follow deployment. No scope or token-store changes.
Native Von task: #V#task_agent_730c566618d7d98ecad7fc6d263cb02c.