Tool-specific limitations to plan around
Scrapy reads proxy settings at middleware level and rotates nothing on its own. HTTP_PROXY and HTTPS_PROXY environment variables or a custom downloader middleware supply the endpoint; HttpProxyMiddleware is enabled by default and consumes those variables.
- Set the endpoint once per crawler run and keep it fixed for the whole crawl session.
- Configure the endpoint before enabling retry or concurrency changes so test results reflect the real path.