thumb|350px|right|Diagram of a double POST problem encountered in user agents. thumb|350px|right|Diagram of the double POST problem above being solved by PRG. Post/Redirect/Get (PRG) is a web development design pattern that lets the page shown after a form submission be reloaded, shared, or bookmarked without ill effects, such as submitting the form another time.
thumb|350px|right|Diagram of a double POST problem encountered in user agents. thumb|350px|right|Diagram of the double POST problem above being solved by PRG. Post/Redirect/Get (PRG) is a web development design pattern that lets the page shown after a form submission be reloaded, shared, or bookmarked without ill effects, such as submitting the form another time.
When a web form is submitted to a server through an HTTP POST request, attempts to refresh the server response can cause the contents of the original POST to be resubmitted, possibly causing undesired results, such as a duplicate web purchase. Some browsers mitigate this risk by warning the user that they are about to re-issue a POST request.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).