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Lower the Cloudflare header size test to 10,000 chars #2830

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hahn-kev merged 1 commit into from
Oct 28, 2026
Merged

Lower the Cloudflare header size test to 10,000 chars #2830

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6 changes: 5 additions & 1 deletion backend/Testing/ApiTests/HeaderTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,8 +19,12 @@ public async Task CheckCloudflareHeaderSizeLimit()
10,210 failed 7 times
10,200 failed 1 time
10,195 failed 0 times

Retested October 2026 with random headers: 10,195 failed 1 of 140, 10,100 and 10,000 failed 0 of 80.
The limit depends on the header's content, not just its length: the 10,195 header that failed got 520 on every resend,
but passed once trimmed to 10,175. So stay well below the limit, while keeping headroom over LexAuthUser.MaxJwtLength.
*/
var headerSize = 10195;
var headerSize = 10000;
var iterations = 10; // a slightly bigger sample set, so we're more confident that we're in the clear
var failStatusCodes = new List<HttpStatusCode>();
for (var i = 0; i < iterations; i++)
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