Solve the problem of not reading and writing cookies across domain access in IE browser

Let's say a nested b

Workaround:
The first is simple:
Set System B as a trusted site.
The second type:
IE Set Privacy policy: In the Internet option-> Privacy-> Advanced, the "Replace automatic cookie Processing" option, and "First party Cookies" and "Third-party cookies" are set to accept the following figure:
The third type:
increase the P3P protocol on the head of the response;
Java: Add a filter, in the Dofilter section:
Java code

The code is as follows	Copy Code
HttpServletResponse res = (httpservletresponse) response; Res.setheader ("P3P", "Cp=cao PSA our");

P3P is what, do what use, Google great God will tell very clear, here will not say;
Header information to increase the P3P protocol, through the Google great God can also find a lot of articles;
Here is one thing, this P3P setting is placed in the system of the referenced page (that is, the B system above), this should remember.

PHP Solution:

The code is as follows	Copy Code
@header (' p3p:cp= "CAO COR cura ADMa DEVa our IND ONL COM DEM PRE"];

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Asp. NET:

Response.appendheader ("P3P", "Cp=cao PSA our");