When making an AJAX call on my website, everything runs smoothly except for when it is accessed behind a Zscaler proxy. In that case, the browser throws a CORS error:
"No 'Access-Control-Allow-Origin' header is present on the requested resource."
The specific Request URL triggering this issue is
https://gateway.zscaler.net/auD?origurl={my_url}I am seeking advice on how to make the request without being blocked by Zscaler. Any suggestions?
To ensure proper functionality of your ASP.NET website, it is important to activate CORS and authorize the https://gateway.zscaler.net domain. CORS becomes essential when a resource in a page (such as an AJAX request) originates from a different domain than the one used to serve the page. As per RFC 6454, the scheme (http vs https), address, and port must correspond.
If you have an ASP.NET web API project catering to GetSchedulers requests, adhere to the guidelines provided by Asp.Net WebAPI instructions:
config.EnableCors(); to the void Register(HttpConfiguration config)[EnableCors(origins: "https://gateway.zscaler.net", headers: "*", methods: "*")]In case you are utilizing a distinct server-side implementation, the steps may vary slightly. For instance, if OWIN is being employed, utilize the Microsoft.Owin.Cors nuGet package.
To make the request, consider using JSON-P: . If that method is unsuccessful, explore adjusting the backend resource settings to allow requests from an alternate domain.
To solve the issue with Zscaler on your localhost, the only option is to disable it using a method involving regedit. Typically, Zscaler settings are configured for workstations only. However, once you deploy your application to a test or production server, it should function properly there.
For step-by-step instructions on disabling Zscaler using regedit, refer to the following:
1. Disable the Automatic Proxy Result Cache by accessing the registry key below: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings
2. Set the Value to: EnableAutoproxyResultCache
3. Specify the Type as: REG_DWORD
4. Enter the Data value as: 0 (to disable caching)
If the registry key does not exist, you can create it using the following registry file entry:
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings]"EnableAutoProxyResultCache"=dword:00000000"
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