Taken from stackoverflow
It echoes the data used in your request for any of these types:
- https://httpbin.org/anything Returns most of the below.
- https://httpbin.org/ip Returns Origin IP.
- https://httpbin.org/user-agent Returns user-agent.
- https://httpbin.org/headers Returns header dict.
- https://httpbin.org/get Returns GET data.
- https://httpbin.org/post Returns POST data.
- https://httpbin.org/put Returns PUT data.
- https://httpbin.org/delete Returns DELETE data
- https://httpbin.org/gzip Returns gzip-encoded data.
- https://httpbin.org/status/:code Returns given HTTP Status code.
- https://httpbin.org/response-headers?key=val Returns given response headers.
- https://httpbin.org/redirect/:n 302 Redirects n times.
- https://httpbin.org/relative-redirect/:n 302 Relative redirects n times.
- https://httpbin.org/cookies Returns cookie data.
- https://httpbin.org/cookies/set/:name/:value Sets a simple cookie.
- https://httpbin.org/basic-auth/:user/:passwd Challenges HTTPBasic Auth.
- https://httpbin.org/hidden-basic-auth/:user/:passwd 404'd BasicAuth.
- https://httpbin.org/digest-auth/:qop/:user/:passwd Challenges HTTP Digest Auth.
- https://httpbin.org/stream/:n Streams n–100 lines.
- https://httpbin.org/delay/:n Delays responding for n–10 seconds.
it showed the IP of the requester, which is helpful when you need to whitelist an IP address but aren't sure what it is.
Setup a local test server in one line under Linux:
nc -kdl 8000
Alternatively, to actually send a minimal empty HTTP reply back in order to unblock HTTP clients such as wget that wait for a reply, so you can do more tests afterwards on the other shell without manually interrupting the client
while true; do printf 'HTTP/1.1 200 OK\r\n\r\n' | nc -Nl 8000; done