Analysis of jsonp cross-domain access (front-end and back-end)

Sep 10, 2018 pm 02:20 PM

The content of this article is about the analysis of jsonp cross-domain access (front-end and back-end). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1. What is cross-domain access

Give a chestnut: In website A, we hope to use Ajax to obtain specific content in website B. If website A and website B are not in the same domain, then there will be a cross-domain access problem. You can understand that two domain names cannot send requests or request data across domain names, otherwise it will be unsafe. Cross-domain access violates the same-origin policy. For detailed information on the same-origin policy, you can click on the following link: Same-origin_policy; Domain name or IP) resources.

2. What is JSONP

JSONP (JSON with Padding) is a "usage mode" of JSON that can be used to solve the problem of cross-domain data access by mainstream browsers.

Due to the same-origin policy, generally speaking, web pages located at server1.example.com cannot communicate with servers other than server1.example.com, and the

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