How Can I Disable the Same-Origin Policy in Chrome for Development or Testing?

How to Disable Same-Origin Policy in Chrome

The Same-origin policy (SOP) is a crucial security measure in web browsers that restricts communication between resources from different origins. However, for specific testing or development scenarios, it may be necessary to circumvent this policy.

One way to disable the SOP on Google's Chrome browser is to use the --disable-web-security argument. This method involves restarting Chrome with a special command-line switch:

Command:

Close all instances of Chrome and execute the following command:

chromium-browser --disable-web-security --user-data-dir="[directory]"

Please replace [directory] with the desired path to the user data directory.

Note:

• Ensure all Chrome instances are terminated before running the command.
• Chrome may display a warning regarding an unsupported command line, which can be ignored.

As per the Chromium source, the kDisableWebSecurity flag disables the enforcement of the SOP. Previously, in Chrome versions before 48, the command chromium-browser --disable-web-security was sufficient. However, the current method provides more control over the user data directory and persistent storage locations.

By disabling the SOP, you allow resources from different origins to communicate with each other, which can be useful for testing cross-origin functionality or accessing contents of external websites embedded in local pages. However, it is important to note that disabling this policy weakens the browser's security and should only be used for specific debugging or development purposes.

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