HTTP412 error

Problem description

Customer configured monitored the page, but the monitored data found a large number of HTTP 412 error, causing the monitoring to be unavailable.

Problem analysis

1.Error explanation: In the HTTP protocol, the response status code 412 Precondition Failed (precondition failed) indicates the client Error, which means that access to the target resource Request is denied. This usually occurs when the precondition specified by the header field If-Unmodified-Since or If-None-Match is not met when using methods other than GET and HEAD to perform conditional Request. At this time, the Request operation—usually uploading or modifying files—cannot be performed, thus returning the Error status code.
2. In layman’s terms: The customer page is a barrier set up to prevent crawlers. For users, it does not delay use.

Corporate WeChat screenshot_17182746162104.webp

3. It does not delay usage for users, but is unavailable for our monitoring.

Solution

Open a whitelist for Tingyun monitoring access and use UA identification. When Tingyun accesses, 412Error will not be thrown;

2. Convert the monitoring data status code, consider 412 as normal monitoring, and convert 412 to 200;

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Problem description

Problem analysis

Solution