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e2234497b7
* Overwrite proxy headers based on directive Headers of the request sent by the proxy upstream can now be modified in the following way: Prefix header with `+`: Header will be added if it doesn't exist otherwise, the values will be merge Prefix header with `-': Header will be removed No prefix: Header will be replaced with given value * Add missing formating directive reported by go vet * Overwrite up/down stream proxy headers Add Up/DownStreamHeaders to UpstreamHost Split `proxy_header` option in `proxy` directive into `header_upstream` and `header_downstream`. By splitting into two, it makes it clear in what direction the given headers must be applied. `proxy_header` can still be used (to maintain backward compatability) but its assumed to be `header_upstream` Response headers received by the reverse proxy from the upstream host are updated according the `header_downstream` rules. The update occurs through a func given to the reverse proxy, which is applied once a response is received. Headers (for upstream and downstream) can now be modified in the following way: Prefix header with `+`: Header will be added if it doesn't exist otherwise, the values will be merge Prefix header with `-': Header will be removed No prefix: Header will be replaced with given value Updated branch with changes from master * minor refactor to make intent clearer * Make Up/Down stream headers naming consistent * Fix error descriptions to be more clear * Fix lint issue