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Sets fallback header values for every request the connection sends. A default header is only applied when the request does not already have a header of that name, so anything set elsewhere on the request wins and these values fill in the gaps. Use this when you want a sensible standard value, such as a default Accept or User-Agent, while still letting individual requests override it.

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This plugin fills in default headers on outgoing requests rather than transforming entity data, so there is no before/after to show. The example below sets a default Accept and User-Agent that are used only when the request has not already set them.