Solve the cross-domain problem of session in thinkphp

When used locally, everything is normal; both the back-end project and the front-end project are deployed to the server, and everything is normal; after the back-end project is deployed to the server, and cross-domain access is set to allow cross-domain access, the local front-end project When using the back-end project interface on the server, a problem arises:

First, use postman to test the interface for obtaining the image verification code and verifying the image verification code interface, which is normal.

Then, use the interface to obtain the image verification code in html, it works fine; finally, use the interface to verify the image verification code in JS, but an error occurs! ! !

Analysis

Through the problem description, we can see that the problem occurs across domains. So, there are two possibilities, one is because the cross-domain settings are incorrect; the other is because of a problem with thinkphp itself.

Using another cross-domain configuration, the problem still exists. That is a problem with thinkphp itself. After searching for information, the problem is located in thinkphp's session cross-domain.

Cross-subdomain solution

In fact, whether it is ThinkPHP or PHP itself, session.cookie_domain needs to be set when solving session cross-domain problems.
The solutions to the problem of cross-domain session mainly include the following:

The first case: If there is no .htaccess file in the directory, that is, if the url is not pseudo-static, then, Add in the first line of conf/config.php:

ini_set('session.cookie_domain',".domain.com");//跨域访问Session

If you enable debugging, it can be used! But if debugging is turned off, it doesn't work!

Second case: If there is a .htaccess file in your directory, then you add in the root directory, the first line of index.php:

This method does not matter whether it is enabled or not. It works for debugging!

However, our problem is not a cross-subdomain problem, but a completely cross-domain problem, so the above method is invalid.

Complete cross-domain solution

Get image verification code request

View the request information to get the image verification code, Request Headers are:

Accept:image/webp,image/*,*/*;q=0.8
Accept-Encoding:gzip, deflate, sdch
Accept-Language:zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4
Connection:keep-alive
Cookie:pma_lang=zh_CN; pma_collation_connection=utf8_unicode_ci; pma_iv-1=wnpO4gv0eQRW1AMHmGr2ww%3D%3D; pmaUser-1=weZPqS0%2BW7nzFUVHRdqcfA%3D%3D
Host:api.voidking.com
Referer:http://localhost/ajax/ajax.html
User-Agent:Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Response Headers are:

Access-Control-Allow-Origin:*
Cache-Control:post-check=0, pre-check=0
Cache-Control:private, max-age=0, no-store, no-cache, must-revalidate
Connection:keep-alive
Content-Type:image/png
Date:Sun, 27 Nov 2016 12:10:44 GMT
Expires:Thu, 19 Nov 1981 08:52:00 GMT
Pragma:no-cache
Server:nginx
Set-Cookie:PHPSESSID=721t4sqanvsii550m1dk8gq1o3; path=/; domain=.voidking.com
Transfer-Encoding:chunked

Verification verification code request

View the request information for verification verification code, Request Headers are:

Accept:application/json, text/javascript, */*; q=0.01
Accept-Encoding:gzip, deflate
Accept-Language:zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4
Connection:keep-alive
Content-Length:9
Content-Type:application/x-www-form-urlencoded; charset=UTF-8
Host:api.voidking.com
Origin:http://localhost
Referer:http://localhost/ajax/ajax.html
User-Agent:Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Response Headers are:

Access-Control-Allow-Origin:*
Cache-Control:no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Connection:keep-alive
Content-Encoding:gzip
Content-Type:text/html; charset=UTF-8
Date:Sun, 27 Nov 2016 12:13:21 GMT
Expires:Thu, 19 Nov 1981 08:52:00 GMT
Pragma:no-cache
Server:nginx
Set-Cookie:PHPSESSID=149t0hhs2icqaaemvp39onkgp4; path=/; domain=.voidking.com
Transfer-Encoding:chunked
Vary:Accept-Encoding

Get the image verification code request again

Request Headers are:

Accept:image/webp,image/*,*/*;q=0.8
Accept-Encoding:gzip, deflate, sdch
Accept-Language:zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4
Cache-Control:max-age=0
Connection:keep-alive
Cookie:pma_lang=zh_CN; pma_collation_connection=utf8_unicode_ci; pma_iv-1=wnpO4gv0eQRW1AMHmGr2ww%3D%3D; pmaUser-1=weZPqS0%2BW7nzFUVHRdqcfA%3D%3D; PHPSESSID=721t4sqanvsii550m1dk8gq1o3
Host:api.voidking.com
Referer:http://localhost/ajax/ajax.html
User-Agent:Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Response Headers are:

Access-Control-Allow-Origin:*
Cache-Control:private, max-age=0, no-store, no-cache, must-revalidate
Cache-Control:post-check=0, pre-check=0
Connection:keep-alive
Content-Type:image/png
Date:Sun, 27 Nov 2016 13:26:21 GMT
Expires:Thu, 19 Nov 1981 08:52:00 GMT
Pragma:no-cache
Server:nginx
Transfer-Encoding:chunked

Comparison of three requests

#The first time to obtain the image verification code request, there is no PHPSESSID in the cookie, so the return information contains Set-Cookie. In the second request to obtain the image verification code, the cookie contains PHPSESSID, so Set-Cookie is not included in the return information.

And the PHPSESSID in the information Set-Cookie returned by the first request is the same as the PHPSESSID in the request information Cookie in the second request.

The ajax request to verify the image verification code does not have a cookie, and naturally there is no PHPSESSID, so the return information also contains Set-Cookie.

It can be seen that we need to make some modifications on the front end to send the request with Cookie.

Front-end jquery settings

The error when requesting is as follows:

A wildcard '*' cannot be used in the 'Access-Control-Allow-Origin' header when the credentials flag is true. Origin 'http://localhost' is therefore not allowed access. The credentials mode of an XMLHttpRequest is controlled by the withCredentials attribute.

A cross-domain error occurred. It can be seen that the backend also needs to make some modifications so that It can receive cross-domain cookies.

Backend nginx settings

add_header Access-Control-Allow-Origin http://localhost;
add_header Access-Control-Allow-Credentials true;

Note:
When the server-side Access-Control-Allow-Credentials parameter is true, the Access-Control-Allow-Origin parameter The value cannot be *.

After the backend nginx is set up, jquery's ajax request is normal and cookies can be carried. The backend receives data normally and returns the data.

Since angular's ajax request is different from jquery, we also need to study how angular sends cross-domain requests carrying cookies.

Front-end angular settings

Recommended tutorial: "TP5"

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