About JSONP The value of a cookie in a cross-domain process is always null

Today, the small partners in the technology Exchange group have been plagued by a problem, which is that the cookie is empty when the value in the cookie is written again.

He got tangled up in the problem one day and I was wondering about the day

Finally, he solved it when he got off work.

I'm here to collect a fisherman's benefit.

:

This is the cross-domain of his AJAX request

This is the operation of a read-write cookie written in the ASHX general handler.

That's the problem, the code is fine, but the second time in the cookie is not getting pinched.

Finally, the solution he gave was

Add context at the beginning of ashx. Response.AddHeader ("P3P", "Cp=cao PSA our");

This is the end:

And then we can find the value of the cookie.

This phrase means "allow third-party cookies to read and write" statements

Bingo

About JSONP The value of a cookie in a cross-domain process is always null