The WeChat official account interface test passed, why does the WeChat server still prompt that the service is abnormal?

WeChat official account development: The interface test is normal, but the WeChat server prompts abnormal service?

During the development of WeChat official account, developers often encounter this situation: the interface test is normal, but the WeChat server continues to report an error, prompting "service exception". This article will analyze the cause of the problem through a practical case and provide solutions.

In the case, when the developer conducted a test of the WeChat official account interface, the results showed normal. However, the WeChat server continued to alert, prompting "The response after the WeChat server pushed a message or event, was illegal", and there were 51 errors in 5 minutes. The error message contains OpenID, OuterIP and the return content of the exception, such as the garbled "ri ni daye1" and an XML structure, but<content></content> The label is empty. The developer tried to adjust the order of ToUserName and FromUserName , but the problem still exists.

The root cause of the problem lies in the PHP method of the developer using echo output in handling messages pushed by WeChat server. The WeChat server needs to receive a legal XML format response, and the content output by echo will interfere with normal XML return, causing the server to determine that the response is illegal.

Solution: Replace the echo statement in the method with the return statement. Use return to return XML data to avoid interference caused by echo , ensure that the WeChat server receives a complete legal XML response, thereby solving the service abnormality problem.

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