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Internet Solutions
     
 

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  
     
 
Windows
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.

Apache
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  
     
 
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Frequency is relative to other Internet warnings and errors.
 
   
  Solutions and Fixes  
     
 

This issue can only be fixed by the web site owner.

 
Notify Webmaster
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    Add    Flag
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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.

 
   
 
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  FaultWire Staff
Posted: 8-Oct-2008
 
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  Official Explanation  
     
 
  technical details

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.

(From Hypertext Transfer Protocol -- HTTP/1.1)
 
   
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  Notes  
     
  "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.