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412
Precondition Failed
Description
We read this to mean the web page seems to be different than expected. We're not sure you would ever encounter this issue unless the site was corrupted.
Examples
Server Error
412 - Precondition set by the client failed when evaluated on the Web server.
The request was not completed due to preconditions that are set in the request header. Preconditions prevent the requested method from being applied to a resource other than the one intended. An example of a precondition is testing for expired content in the page cache of the client.
Precondition Failed
The request was not completed due to preconditions that are set in the request header.
Preconditions prevent the requested method from being applied to a resource other than the one intended.
Web Server at ...
Error messages will differ depending on the web server and if replaced by the web site designers.
Occurrences
Frequency is relative to other Internet warnings and errors.
Solutions and Fixes
This issue can only be fixed by the web site owner.
Solution 1 of 1 - Notify Webmaster
46
You might notify the webmaster about the issue. Include the error number and the address (URL) where the error occurred along with any other relevant details.
Many sites use an email address in the form webmaster@sitename.com where you replace sitename.com with the web sites address (don't include a www). Keep in mind with the amount of spam, they may use a different address and/or it might get ignored. Check the websites' contact information to get reliable contact information.
Official Explanation
The precondition given in one or more of the request-header fields evaluated to false when it was tested on the server. This response code allows the client to place preconditions on the current resource metainformation (header field data) and thus prevent the requested method from being applied to a resource other than the one intended.
"412 Precondition Failed" is supported by most Web Servers.
The four hundred series of errors indicate something was sent to the remote web server incorrectly.
While we believe this information up to date and accurate, FAQware is not responsible for any inaccuracies. If you find something that is out of date or inaccurate, please let us know at
so we can correct it.
