Update Header

This module provides an example of overwrite a particular header value from the client and from the origin with a new value.

class callouts.python.extproc.example.update_header.service_callout_example.CalloutServerExample(*args: Any, **kwargs: Any)[source]

Bases: CalloutServer

Example callout server.

For request header callouts we provide a mutation to update a header ‘{header-request: request}’, and to clear the route cache.

On response header callouts, we respond with a mutation to update the header ‘{header-response: response}’.

Usage:

To use this example callout server, instantiate the CalloutServerExample class and run the gRPC service.

on_request_headers(headers: envoy.service.ext_proc.v3.external_processor_pb2.HttpHeaders, context: ServicerContext) → envoy.service.ext_proc.v3.external_processor_pb2.HeadersResponse[source]

Custom processor on request headers.

Parameters:

  • headers (service_pb2.HttpHeaders) – The HTTP headers received in the request.

  • context (ServicerContext) – The context object for the gRPC service.

Returns:

The response containing the mutations to be applied to the request headers.

Return type:

service_pb2.HeadersResponse

on_response_headers(headers: envoy.service.ext_proc.v3.external_processor_pb2.HttpHeaders, context: ServicerContext) → envoy.service.ext_proc.v3.external_processor_pb2.HeadersResponse[source]

Custom processor on response headers.

Parameters:

  • headers (service_pb2.HttpHeaders) – The HTTP headers received in the response.

  • context (ServicerContext) – The context object for the gRPC service.

Returns:

The response containing the mutations to be applied to the response headers.

Return type:

service_pb2.HeadersResponse