proxy

This package contains the code for Cypress's HTTP interception proxy.

HTTP interception

./lib/http contains the code that intercepts HTTP requests. The bulk of the proxy's behavior is in three files:

request-middleware.ts contains code that manipulates HTTP requests from the browser
response-middleware.ts contains code that manipulates HTTP responses to the browser
error-middleware.ts handles errors that occur in the request/response cycle

Note: you should not ever need to build the .js files manually. @packages/ts provides require-time transpilation when in development.

yarn workspace @packages/proxy build-prod

Tests are located in ./test

To run tests:

yarn workspace @packages/proxy test

Additionally, the server package contains tests that use the proxy.

High level logs are available in the DEBUG=cypress:proxy:* namespace.

Detailed per-request logs are available in DEBUG=cypress-verbose:proxy:http.