http-status-code-412 – Tarik Billa

Http Status Code 400 vs 412

December 12, 2023 by Tarik

Use 400 if the request parameters are wrong. Use 412 if one of the If-* request headers like If-Match, If-Modified-Since, etc are wrong. Why? That’s just what RFC says. See for example this extract of If-Match specification: If none of the entity tags match, or if “*” is given and no current entity exists, the … Read more

When is it appropriate to respond with a HTTP 412 error?

March 5, 2023 by Tarik

If you look at RFC 2616 you’ll see a number of request headers that can be used to apply conditions to a request: If-Match If-Modified-Since If-None-Match If-Range If-Unmodified-Since These headers contain ‘preconditions’, allowing the client to tell the server to only complete the request if certain conditions are met. For example, you use a PUT … Read more