What is ajax cross domain

What is AJAX cross-domain issue

Simply put, it is when the front-end calls the back-end service interface

If the service interface is not in the same domain, cross-domain problems will occur

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AJAX cross-domain scenario

Separate front-end and service-oriented development model

The front-end and front-end development are independent, and the front-end needs to call a large number of back-end interfaces

As long as the back-end interfaces are not the same A domain will cause cross-domain problems

Cross-domain problems are very common, and it is also important to solve cross-domain problems

AJAX cross-domain reasons

Browser restrictions: Browser security verification restrictions

Cross-domain (any difference in protocol, domain name, and port will be considered cross-domain)

XHR (XMLHttpRequest) request

AJAX cross-domain problem solving ideas

Browser: The browser removes cross-domain verification, which has little actual value

XHR: Do not use XHR, use JSONP, There are many disadvantages and cannot meet the current development requirements

Cross-domain: The callee is modified to support cross-domain calls (specified parameters); the caller is modified to hide cross-domain (based on proxy)

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