Unexpected server-side reset

[markrabinovich123]

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We are using actix server as: ] [[package]] name = "actix-web" version = "4.9.0"

From time to time we are facing a reset from the server side, right after a request comes down.

Expected Behavior

No reset until the handle returns.

Current Behavior

server resets connection some 100-500ms after the request comes in.

Possible Solution

None

Steps to Reproduce (for bugs)

1. Not possible to reproduce outside our labs.
2. We are working on getting logs.
3. We can't send a complete packet captures, but a brief of dissectors is added below.

Context

No. Time Source Destination Protocol Length Info 187 2025-04-24 16:37:31.198108 x.x.x.x y.y.y.y HTTP 1608 GET /someurl/somehandle HTTP/1.1 188 2025-04-24 16:37:31.198143 x.x.x.x y.y.y.y TCP 68 9003 → 14218 [ACK] Seq=1 Ack=1541 Win=353 Len=0 TSval=909509221 TSecr=4175918997 221 2025-04-24 16:37:31.612680 x.x.x.x y.y.y.y TCP 68 9003 → 14218 [RST, ACK] Seq=1 Ack=1541 Win=353 Len=0 TSval=909509636 TSecr=4175918997

Your Environment

rustc 1.85.1 (4eb161250 2025-03-15)

• Rust Version (I.e, output of rustc -V):
• Actix Web Version: 4.9.0