HTTP input validation is a process that checks the input data received by a server from a client (typically a web browser) to ensure that it conforms to the expected format and structure. The process involves verifying that the input data contains only allowed characters, that it is of the expected length and format, and that it is free from malicious code or script injections. HTTP input validation works by performing various checks and verifications on the input data using regular expressions, syntax parsing, and other security algorithms to identify any potential security threats. Once the input data is validated, it is considered safe and only then processed by the application server, which then sends a response back to the client. Adequate and proactive HTTP input validation is essential for web applications that allow user input to prevent against unauthorized access, data theft, and injection attacks.
