How to solve the cross-domain problem of Ajax request WebService

This article mainly introduces how to solve the cross-domain problem of Ajax request WebService. It is very detailed and has a certain reference value. Interested friends must read it!

1. Background

Using Ajax in Jquery to call WebService Interface in asp.net Development Environment

2. Problems that arise

Reason analysis: the influence of the same origin policy of the browser (that is, JavaScript or Cookie can only access content in the same domain)

3. Solution:

(1) JSONP: only GET is supported

(2) CROS: cross-domain resource sharing

The following is the CROS solution:

a. Add a response header to the WebService interface:

b. Add the relevant configuration section information to the web.config file:

After using the solution of an or b, the changes in the browser header information are as follows:

In the end, the problem is well solved, but the support for this solution varies from browser to browser, as shown in the figure below:

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