Understanding the Differences Between HTTP GET and POST Methods
This article explains the fundamental distinctions between HTTP GET and POST requests, covering how parameters are transmitted, browser and server behaviors, length limits, security implications, underlying TCP mechanics, and performance trade‑offs, while also debunking common misconceptions often seen in interview answers.
GET and POST are the two basic HTTP request methods; GET includes parameters in the URL while POST sends them in the request body.
The commonly cited differences—such as bookmarkability, caching, URL length limits, and safety—stem from how browsers and servers handle these methods and from practical constraints like URL length limits (≈2 KB) and server limits (≈64 KB).
Both methods operate over TCP/IP, so at the transport layer they are similar; the real distinction lies in HTTP’s rules and the behavior of browsers and servers.
POST typically involves a two‑step handshake (header, 100 Continue, then body), resulting in two TCP packets, whereas GET sends header and data together in one packet, which can make GET appear faster but also less semantically appropriate for certain operations.
While GET is more cache‑friendly and suitable for safe, idempotent requests, POST should be used when sending sensitive data or when the request changes server state.
Performance differences are usually negligible on good networks, but on poor connections the extra round‑trip of POST can matter; however, some browsers (e.g., Firefox) may optimize POST to a single packet.
Understanding these nuances helps answer interview questions accurately and avoid the pitfalls of oversimplified “standard answers.”p>
Selected Java Interview Questions
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