Httpcode417 error returned by CURL

For example, the server suddenly reported an alarm this afternoon. The http_code417 error is returned for all the interfaces that access one of the servers. Data is normally returned for the same code on other servers. All request CURL methods are completed through the same basic http request class library. although the most... for example, this afternoon, the server suddenly reported an alarm, and all the interfaces that access one of the servers returned Http_code417 error. If the same code is on another server, data is normally returned. All requested CURLThe methods are based on the same HttpRequests the class library to complete.

AlthoughStackoverflowFind the solution, but why is error 417 returned?

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For example, this afternoon, the server suddenly reported an alarm, and all the interfaces that access one of the servers returnedHttp_code417 error. If the same code is on another server, data is normally returned. All requestedCURLThe methods are based on the sameHttpRequests the class library to complete.

AlthoughStackoverflowFind the solution, but why is error 417 returned?

It is related to the server environment. refer to two blog posts.
Http://blog.csdn.net/wudiyi815/article/details/8650341
Http://www.cnblogs.com/zox2011/archive/2013/06/06/3121247.html