This HTTP request builder lets you compose a full HTTP call — method, URL, headers, query parameters, and body — through a visual UI, then instantly generates the equivalent code as a cURL command, browser fetch(), axios, Python requests, and Node fetch. You can also fire the request live from your browser to inspect the status, response headers, and body (subject to CORS). It's ideal for drafting API calls, reproducing bug reports, sharing reproducible curl snippets with teammates, and bootstrapping HTTP client code in multiple languages without leaving the tab.
Access-Control-Allow-Origin headers. Internal or auth-protected APIs will usually fail with a CORS error — copy the generated cURL or Python code and run it from a terminal instead.\ line continuations for readability, browser fetch(), axios, Python requests (using json= when Content-Type is JSON, data= otherwise), and Node fetch. Each tab has its own copy button, so moving code into a script, notebook, or CI job takes a single click.fetch() calls only succeed when the target server responds with a permissive Access-Control-Allow-Origin header (and handles the CORS pre-flight for non-simple requests). Most internal or authenticated APIs don't, so the browser blocks the response — not because the server is down, but because the browser refuses to expose it. CORS only restricts browser JavaScript. Copy the generated cURL, Python, or Node snippet and run it from a terminal to bypass CORS entirely.'\'' pattern. Python output automatically switches to json= so requests serializes the payload and sets Content-Type for you.URLSearchParams semantics (the same rules the built-in URL object applies), so spaces become +, reserved characters are percent-encoded, and duplicate keys produce repeated parameters (?tag=a&tag=b) — the standard way most APIs expect array-valued params. If your URL already contains a query string, the new params are appended with & instead of ?.