Chrome ERR_HTTP2_PROTOCOL_ERROR — HTTP/2 Protocol Failure

Chrome ERR_HTTP2_PROTOCOL_ERROR indicates an HTTP/2 framing error between the browser and server, often caused by server misconfiguration or proxy interference. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: HTTP/2 is a binary protocol with strict framing requirements. Servers, proxies, or CDNs can send malformed HTTP/2 frames. More common with reverse proxies like nginx misconfigured for HTTP/2. Can be intermittent if the issue is related to specific request types. Chrome is stricter about HTTP/2 compliance than some other browsers. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Server or reverse proxy sending malformed HTTP/2 frames. Content-Length header mismatch with actual response body size. Proxy or CDN incorrectly handling HTTP/2 stream multiplexing. Server closing HTTP/2 streams unexpectedly (GOAWAY or RST_STREAM). Response body truncated due to upstream timeout. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Test in Firefox — if it works there, the server may have a Chrome-specific HTTP/2 issue. Try disabling HTTP/2: type chrome://flags, search 'HTTP/2', disable and restart Chrome (temporary test). Open Chrome DevTools > Network > check the failing request for response headers. If you own the server, check nginx/Apache HTTP/2 configuration and update to latest version. Report the issue to the website — it is likely a server-side configuration problem. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Browser Errors collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.