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ERR_TLS_ALPN_CALLBACK_INVALID_RESULT

tls alpn callback invalid result

What does this code mean?

Code ERR_TLS_ALPN_CALLBACK_INVALID_RESULT · An issue reported by Node.js.

Official explanation · Original text

This error is thrown when an ALPNCallback returns a value that is not in the list of ALPN protocols offered by the client.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

Errors | Node.js v26.13.1 Documentation ↗

Creator: Node.js contributors; Joyent, Inc. and other Node contributors
License: MIT License (Node.js documentation)
Checked on: 2026-11-12

Modifications: English prose extracted; whitespace normalized; Korean context and classified official links added. Python code examples not redistributed.

Source details · Original licenses and notices