Ajax JSON cross-origin request service (WebApi, WCF or other)

Ajax JSON cross-origin request service (WebApi, WCF or other)
The program works normally under a single IIS. When you switch to a domain name (Server Load balancer), various cross-domains are enabled. As long as the following conditions are met, a general solution is available: 1. HTTP Method: GET, Head, POST method 2. use the POST method and Content-Type other than application/x-www-form-urlencoded, multipart/form-data, or text/plain. For example: send XML, JSON, and so on using POST. 3. use custom header solution: Remove OPTIONSVerbHandler Handle Mapping under IIS, or add the following in WebConfig: <system. webServer>