Chrome Extensions: Read Back the Effective Proxy Configuration
Inspect completion, value.mode, levelOfControl and scope before treating a set callback as evidence of the browser's actual route.
A successful settings.set() completion tells you less than a successful browser request through the intended endpoint. Read back the effective ChromeSetting after the asynchronous operation completes, handling its error path first.
| Read-back detail | Question it answers |
|---|---|
value.mode | Is this system configuration, fixed servers or PAC? Read fields appropriate to that shape rather than assuming a top-level host. |
levelOfControl | Can this extension control the setting, and is it controlled by this or another extension? Managed policy can restrict changes. |
| Scope and browsing context | Are you inspecting the regular or intended incognito arrangement? Use the API's documented read/write options. |
A read launched immediately after starting the set operation can race it. A read of the wrong property can make a valid system or PAC configuration appear empty. Neither observation establishes that the remote proxy rejected anything.
If a settings control is disabled, inspect the controlling policy or extension rather than repeatedly writing a competing store. Chrome can combine system settings, command-line configuration, extensions and policy.
Once the effective configuration is understood, examine the route for the destination. PAC or a bypass may deliberately choose direct access. If it selects the expected proxy, endpoint availability, authentication and observed exit remain questions for the actual browser request; configuration read-back is not a health check.