Solution to automatically add pre tag to ajax return value

The content returned by ajax actually automatically adds the pre tag. The solution is to modify the return type of the general handler. If you encounter a similar situation, you can refer to the following

ajax returns, automatically adds the pre tag

The content returned by ajax actually automatically adds the

 tag

In FF, IE, and Google Chrome, each return is different: ff lowercase, IE uppercase, Google plus style 
After checking, it turns out that the returned type is wrong. 
Final solution, modify the return type of the general handler
Modify 
context.Response.ContentType = "text/plain";
 to 
context.Response.ContentType = "text/html";
The above is what I compiled for everyone. I hope it will be helpful to everyone in the future. 
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