Why Does My Website Show a net::ERR_HTTP2_PROTOCOL_ERROR 200 in Google Chrome but Not Other Browsers?

Decoding the net::ERR_HTTP2_PROTOCOL_ERROR Code

The net::ERR_HTTP2_PROTOCOL_ERROR 200 error signifies a protocol mismatch between a web client and server while attempting communication using HTTP/2. It is commonly encountered in modern web browsers such as Google Chrome.

Causes and Implications

This error often arises due to various factors, including:

• Server misconfigurations
• Invalid HTTP headers
• Network connectivity issues
• Browser software bugs
• Insufficient disk space on the server

Specific Instance Analysis

The given scenario demonstrates the error occurring when attempting to load a web page over HTTPS in Google Chrome. Simultaneously, an external Twitter feed fails to render, accompanied by console messages indicating the HTTP2 protocol error.

Findings and Observations

Through further investigations, the following insights were gathered:

• The error persists even without the Twitter feed code.
• It only occurs when accessing the website over HTTPS.
• Other web browsers (Edge, Firefox) do not trigger the error.
• It appears on recent Google Chrome versions (75 ), regardless of operating system.

Possible Root Cause

The returned header for the failing resource shows a 200 status code, indicating a successful request. However, the error persists, suggesting a deeper underlying issue.

In one specific case, the culprit turned out to be insufficient disk space on the web server. This highlights that the error can stem from server-side issues as well.

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