spring-projects / spring-projects/spring-framework

Optimize get for all values in ServletRequestHeadersAdapter and ServletResponseHeadersAdapter

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#37,080 2 comments 0 reactions 1 assignee View on GitHub

@rstoyanchev is already working on this.

Since Jul 21, 2026.

in: web type: enhancement
Dominant language
Java
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Description

The Servlet API uses Enumeration for the values of a header, and currently we copy those into a new List on each call, which can make a big difference in a benchmark test as in #37042.

We can look to make this more optimal.

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