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[appendix]
== Migrating from Gun 2.0 to 2.1
Gun 2.1 contains a small security improvement for
the HTTP/2 protocol, as well as includes a small
number of fixes and improvements.
Gun 2.1 requires Erlang/OTP 22.0 or greater.
=== Features added
* A new HTTP/2 option `max_fragmented_header_block_size` has
been added to limit the size of header blocks that are
sent over multiple HEADERS and CONTINUATION frames.
* Update Cowlib to 2.13.0.
=== Bugs fixed
* Gun will no longer configure the NPN TLS extension,
which has long been replaced by ALPN. NPN is not
compatible with TLS 1.3.
* Gun will no longer crash when TLS connections close
very early in the connection's life time.
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