on_remote_request

The on_remote_request lifecycle event is triggered when the proxy is about to send a request to the remote server.

Please note that unlike on_request, this is not guaranteed to happen for every transaction. For example, if a previous event forged a response, or if the request is served from the cache, this event will not be triggered.

This allows to write logic that is specific for outgoing requests.

TOML

[rules."*"."*"]
on_remote_request = """
print(f'Hello, {request}.')
"""

YAML

rules:
  "*":
    "*":
      on_remote_request: |
        print(f'Hello, {request}.')

The event instance passed to on_remote_request lifecycle event scripts is a HttpClientFilterEvent.

Note

The request and response (if set) variables are instances of httpx.Request and httpx.Response.

Adding a header

You can add a header to the outgoing request:

[rules."*"."*"]
on_remote_request = """
request.headers['X-Hello'] = 'World'
"""

Forging a response

If a Response is set in this event, the outgoing request will not be sent, and your response will be used instead.

[rules."*"."*"]
on_remote_request = """
from httpx import Response
response = Response(200, content=b'Hello, World!')
"""

Context reference

The following variables are available in the context of the on_remote_request lifecycle event:

• logger: the logger instance.

• event: the HttpClientFilterEvent instance.

• endpoint: the endpoint name for this transaction, as defined in your configuration.

• request: the prepared httpx.Request instance, ready to be sent.

• response: an eventual httpx.Response instance, but most probably None. Set this to a httpx.Response to forge a response, bypassing the remote request.

• stop_propagation: a function to stop the event propagation to the next event in the chain.