Information:

Environment

  • Dynatrace Portal
Symptoms

We made changes to our web server recently, and now we see the HTTP error 412 Precondition Failed. Why does this error happen, and what does it mean?

Solution

The 412 Precondition Failed error message is a standard HTTP error code.

When parsing a webpage, the web server looks for a precondition specification in the browser's HTTP data: specifically, one or more of the request's header fields. If the precondition is not met in the web page, the server returns the 412 error.

A 412 error is usually caused by a configuration or programming error on the web server, so we recommend that you focus your troubleshooting there.

Refer to the
HTTP 1.1 specification for additional information.

 

 

 

 

 

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