Debugging proxy-related errors can be complex and time-consuming due to the intricate architecture of TLS intercepting forward proxies, which manage two separate TLS connections: the client-to-proxy and the proxy-to-target connections. The introduction of the RFC9209 Proxy-Status header standardizes error reporting, allowing for more precise identification of error sources compared to vague HTTP status codes like 502 Bad Gateway. This standard facilitates a clearer understanding of proxy failures by using structured parameters such as 'error,' 'details,' and 'received-status,' which help distinguish between client-side and target-side issues. The article explains how to implement and parse the Proxy-Status header, demonstrating its utility in reducing troubleshooting time and enhancing automation across proxy networks. Bright Data's transition to adopting RFC9209 from its proprietary headers exemplifies the industry's shift towards universal standards, aiming for interoperability and clarity in error diagnostics across diverse proxy environments.