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0x2

INTERNAL_ERROR

Stream-levelConnection-levelRFC 9113 §7

INTERNAL_ERROR (0x2) indicates that the implementation encountered an internal error that is not attributable to the peer's behavior. The sender experienced an unexpected condition that prevented processing. This is the HTTP/2 equivalent of HTTP/1.1 500 Internal Server Error at the framing layer.

Code

0x2

Decimal

2

Standard

RFC 9113 §7

Description

INTERNAL_ERROR is sent when the implementation has a bug or unexpected failure that prevents it from continuing. Unlike PROTOCOL_ERROR which blames the peer, INTERNAL_ERROR is self-reported. Common causes: an unhandled exception in the HTTP/2 frame processing code, a failure in the HPACK compression state that cannot be recovered, or a memory allocation failure. Clients receiving INTERNAL_ERROR should retry the request – it indicates a server-side failure, not a client mistake.

Common Causes

  • –Unhandled exception in HTTP/2 frame processing
  • –HPACK compression state corruption
  • –Memory allocation failure during frame processing
  • –Application server crashed during response generation
RFC 9113 §7 – HTTP/2 Error Codes specification →