What are the eight life cycle hook functions of Vue>>> 
When using PHP to call the Java WebServices interface, the customer has an abnormal error of “HTTP error fetching HTTP headers” from time to time. After the following troubleshooting process, it is finally determined that it is a DNS resolution problem. At present, it has been temporarily solved by using IP method
The troubleshooting process includes: application log viewing, firewall log tracking, etc
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