perf: optimize parseCspHeaders (#29887)

* fix: optimize parseCspHeaders * Added changelog notes * Fix changelog --------- Co-authored-by: Jennifer Shehane <jennifer@cypress.io>
cypress-io · Jul 26, 2024 · 8260150 · 8260150 · cypress-bot · Jul 26, 2024
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diff --git a/cli/CHANGELOG.md b/cli/CHANGELOG.md
@@ -3,6 +3,10 @@
 
 _Released 7/30/2024 (PENDING)_
 
+**Performance:**
+
+- Improved performance of `reduce` in a method within our proxy. Addressed in [#29887](https://github.com/cypress-io/cypress/pull/29887).
+
 **Bugfixes:**
 
 - Fixed an issue where yarn PnP was not working correctly with Cypress and `@cypress/webpack-batteries-included-preprocessor`. Fixes [#27947](https://github.com/cypress-io/cypress/issues/27947).

diff --git a/packages/proxy/lib/http/util/csp-header.ts b/packages/proxy/lib/http/util/csp-header.ts
@@ -107,7 +107,9 @@ export function parseCspHeaders (headers: OutgoingHttpHeaders, headerName: strin
       policy = cspRegExp.exec(cspHeader)
     }
 
-    return [...acc, policies]
+    acc.push(policies)
+
+    return acc
   }, [])
 }