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Ajax notes

2022-04-29 08:10:14Chen Chen is trying

Set request header

// Set request header 
//Content-Type: Set the content type of the request body 
//application/x-www-form-urlencoded: Fixed writing method of parameter query string 

You can also set other header information
for example :

xhr.setRequestHeader('name','cxjcxj');// Self defined 

The browser will report an error :
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What if you don't want him to make a mistake ?
answer :

// Response head 
response.setHeader('Access-Control-Allow-Header','*');// All types of header messages can be received 

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Not yet , Because he will send a message OPTIONS request
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This request will do a new verification , That is, send a request to detect whether the header information is available or not
So next :
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all It means : Can receive any type of request , all http Request for agreement , It can be received here
After operation :
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copyright notice
author[Chen Chen is trying],Please bring the original link to reprint, thank you.

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