Fix Claude API 502 Bad Gateway Error | Anthropic Guide

The HTTP 502 Bad Gateway error is a common networking issue encountered by developers integrating the Anthropic Claude API. Unlike a 400 Bad Request or 429 Rate Limit Exceeded error, a 502 error is not caused by invalid code parameters or budget overruns.

In simple terms, a 502 Bad Gateway means that an edge proxy server (such as Cloudflare, which sits in front of Anthropic's infrastructure) tried to contact the upstream Anthropic API servers to process your request, but received an invalid or empty response. This guide covers how to handle this error programmatically and ensure your production app remains resilient.

Step 1: Identify if the Outage is Local or Global Before modifying your codebase, verify where the network breakdown is occurring.

1. Go to status.anthropic.com and review the history logs specifically for the "API" component. 2. If the API status is green, the 502 error may be isolated to your regional CDN edge node or a temporary routing failure between your cloud host (e.g., AWS, Vercel, Heroku) and Anthropic's gateway. 3. Run a quick terminal diagnostic to check connection routing: curl -I https://api.anthropic.com/v1/messages If this returns a 502 error immediately, the issue is on the edge network.