Proxy ExceptionsList charecter length limit for safari

We are using network proxy on macOS to divert network traffic. We found that when the proxy is configured with an exception list, if we exceed 685 number of characters in the exception list, then Safari is not accepting this exception list. In this case, Safari is connecting to all sites (including sites in the exception list) directly. Where as the same excption list is accepted by other browsers like Google Chrome, Firefox and MS Edge. We have not found any reference to the maximum size of this exception list for Safari browser. 1.Please share any documentation in this regard. 2. Also let us know if we can configure this maximum character limit using any suitable configuration.