This solves a problem that requestb.in does not. Namely, endpoints that predictably return various HTTP headers or HTTP content. This isn&#x27;t about just testing to see what your app is sending. This is about testing how your application or HTTP client or whatever handles various weird HTTP responses and features.<p>If I need to test how my application responds to a relative URL in a Location header, I can hit the &#x2F;relative-redirect&#x2F;:n endpoint. Same for Absolute urls via &#x2F;absolute-redirect&#x2F;:n. The If-Not-Modified stuff is also helpful.