There is an options request before the axios post request, and a cross-domain error is reported. What is the reason for this? How do you need to do it?

what is this options request for?
now it is in this options that there is a cross-domain error
and then there is no post request

normally, there is an options request followed by a post request

Axios http

Mar.22,2021

first divides into simple requests and non-simple requests. Non-simple requests will send OPTIONS requests for pre-checking before.
backend does not allow cross-domain, so according to the same origin policy, the post request does not need to be sent.

need to add the header on your error message at the back end.

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After axios creates an instance, the put request cannot carry the set request header.
after creating the axios instance code, the post,put, is set and the common request header application x-www-form-urlencoded;charset=UTF-8. is set. The request using post carries a custom-set request header, but after using put, the request does not car...

Vue.js axios http

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How does vue use axios to pass an array of objects to the background? And the background can receive this object? (node+express in the background)
I now have an array of objects, such as the following format: let objArray = [ {name: Amy , age: n , age: 18}, {name: Amy , age: n , age: 18}, {name: Amy , age: n , age: 18}, {name: Amy , age: n , age: 18} ] I u...

Node.js vue.js axios http post

Jun.14,2022

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1beeaf3-30961.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1beeaf3-30961.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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