curl: sink: Prefer user set content_type
Since commit b0257368, user set content_type would be overrided by content_type derived from caps. Preserve the content_type if it's set by user.
Fixed #1436 (closed)
Since commit b0257368, user set content_type would be overrided by content_type derived from caps. Preserve the content_type if it's set by user.
Fixed #1436 (closed)