HTTP: Handle HTTP/2 GOAWAY premature close

The problem can be reproduced with a standard nginx version, with ssl and http/2 activated, as by default, nginx recycles http2 connection every 1000 requests

I’ve just modified the standard nginx config ( from ubuntu standard package) with http2 and ssl config:

server {
        listen 443 ssl http2 default_server;
        include snippets/snakeoil.conf;

        root /var/www/html;
        server_name localhost;
}

class BasicSimulation extends Simulation {

  val httpProtocol = http
    .baseUrl("https://localhost") // Here is the root for all relative URLs
    .acceptHeader("text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8") // Here are the common headers
    .doNotTrackHeader("1")
    .acceptLanguageHeader("en-US,en;q=0.5")
    .acceptEncodingHeader("gzip, deflate")
    .userAgentHeader("Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:16.0) Gecko/20100101 Firefox/16.0")
    .enableHttp2
    .disableCaching // caching disabled to reproduce the problem with static resources

   val scn = scenario("Scenario Name") // A scenario is a chain of requests and pauses
    .forever(
      exec(http("request_1")
      .get("/"))
      .pause(10 milliseconds) 
      .exitHereIfFailed
    )
  setUp(scn.inject(constantConcurrentUsers(1) during (5 minutes)).protocols(httpProtocol))
}

The reproduction of the problem depends on the pause duration, the latency between client and server and probably the load of the different systems:

• with a remote system and a slow network, the problem can occurs sometimes with 100ms pause
• with a local/fast server, I had to reduce the pause to 10 ms
• On my real test, I use pace, so when the system starts to slow, I believe the pause time is reduced a lot and explain why the problem occurs

when the error occurs, the following messages can be seen:

---- Errors --------------------------------------------------------------------
i.n.h.c.h.Http2Exception$StreamException: Cannot create stream      1 (100,0%)
 2003 greater than Last-Stream-ID 2001 from GOAWAY.

and then:

i.g.h.c.i.RequestTimeoutException: Request timeout to localhos      1 (20,00%)
t/127.0.0.1:443 after 60000 ms

[niyinsil]

Hi,

package computerdatabase

import io.gatling.core.Predef._
import io.gatling.http.Predef._
import scala.concurrent.duration._

class Http2Sample extends Simulation {

 val httpProtocol = http // 4
    .baseUrl("http://localhost:8081") // 5
    .acceptHeader("text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8") // 6
    .doNotTrackHeader("1")
    .acceptLanguageHeader("en-US,en;q=0.5")
    .acceptEncodingHeader("gzip, deflate")
    .userAgentHeader("Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Firefox/31.0")
	.enableHttp2
    .http2PriorKnowledge(Map("www.google.com" -> true, "gatling.io" -> false))
	.disableCaching

  val scn = scenario("Http2Sample") // 7
    .exec(http("request_1") // 8
      .get("/")) // 9
    .pause(10 milliseconds) // 10
	.exitHereIfFailed

  setUp( // 11
    scn.inject(
	atOnceUsers(1)) // 12
  ).protocols(httpProtocol) // 13
}

I am also facing the same error for aforesaid code, could you please help?

Simulation computerdatabase.Http2Sample started...
11:12:12.307 [WARN ] i.g.h.e.GatlingHttpListener - Request 'request_1' failed for user 1
io.gatling.http.client.impl.HttpAppHandler$1: Premature close
11:12:12.317 [WARN ] i.g.h.e.r.DefaultStatsProcessor - Request 'request_1' failed for user 1: j.i.IOException: Premature close

================================================================================
2019-04-16 11:12:12                                           1s elapsed
---- Requests ------------------------------------------------------------------
> Global                                                   (OK=0      KO=1     )
> request_1                                                (OK=0      KO=1     )
---- Errors --------------------------------------------------------------------
> j.i.IOException: Premature close                                    1 (100.0%)

---- Http2Sample ---------------------------------------------------------------
[##########################################################################]100%
          waiting: 0      / active: 0      / done: 1
================================================================================

Simulation computerdatabase.Http2Sample completed in 0 seconds

[slandelle]

Those people know who’s the best Gatling contributor, Stephane! 😄

Yeah, but then it will remain the same forever if no one else gives it a try 🤷