mod_http_oauth2: Tweak fallback error text Since the oauth error is more like the error condition, a symbolic error code, not the most human-friendly. Many error cases do have human-readable error descriptions that should be fine on their own, or changed to be. As a fallback, capitalize the error name.

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summary: Extra verbose logging of sent and received
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Summary
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Sometimes it is useful to get the raw XML logs from clients for
debugging purposes, but some clients don't expose this.

This module logs dumps everything sent and received into debug logs, for
debugging purposes.