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The web page (or web based application) has told the server it requires (expects) some services or behaviors, but the server cannot provide them. You really should never seen this.
Frequency is relative to other Internet warnings and errors.
Solutions and Fixes
This issue can only be fixed by the web site owner.
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 email@example.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.
FaultWire Staff Posted: 8-Oct-2008
The expectation given in an Expect request-header field (see Section 14.20) could not be met by this server, or, if the server is a proxy, the server has unambiguous evidence that the request could not be met by the next-hop server.
"417 Expectation Failed" is supported by most Web Servers.
The four hundred series of errors indicate something was sent to the remote web server incorrectly.
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