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Traffic Server Debugging

  1. Bring up nginx and Traffic Server containers:

    docker compose up

  2. Generate a ~15MB file to use as the request body:

    base64 /dev/urandom | head -c 15000000 > body.txt

  3. Test against [nginx proxy] => [trafficserver 9.1.4] => [nginx server]:

    for i in {1..20}; do curl -v -d @body.txt -H "Expect:" -X PUT "http://localhost:8914/?i=$i"; done

  4. Test against [nginx proxy] => [trafficserver 9.2.0] => [nginx server]:

    for i in {1..20}; do curl -v -d @body.txt -H "Expect:" -X PUT "http://localhost:8920/?i=$i"; done

  5. Test against [nginx proxy] => [trafficserver 9.2.2] => [nginx server]:

    for i in {1..20}; do curl -v -d @body.txt -H "Expect:" -X PUT "http://localhost:8922/?i=$i"; done

  6. Test against [nginx proxy] => [trafficserver 9.2.3] => [nginx server]:

    for i in {1..20}; do curl -v -d @body.txt -H "Expect:" -X PUT "http://localhost:8923/?i=$i"; done

  7. Test against [nginx proxy] => [trafficserver 9.2.4] => [nginx server]:

    for i in {1..20}; do curl -v -d @body.txt -H "Expect:" -X PUT "http://localhost:8924/?i=$i"; done

Expected Behavior: Traffic Server 9.1.4

Under Traffic Server 9.1.4, all of the responses received back are the 413 Request Entity Too Large error generated by the underlying nginx server. This is the expected behavior.

*   Trying 127.0.0.1:8914...
* Connected to localhost (127.0.0.1) port 8914 (#0)
> PUT /?i=1 HTTP/1.1
> Host: localhost:8914
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 15000000
> Content-Type: application/x-www-form-urlencoded
>
* We are completely uploaded and fine
< HTTP/1.1 413 Request Entity Too Large
< Server: nginx/1.25.2
< Date: Sun, 10 Sep 2023 23:14:51 GMT
< Content-Type: text/html
< Content-Length: 183
< Connection: keep-alive
< Age: 0
<
<html>
<head><title>413 Request Entity Too Large</title></head>
<body>
<center><h1>413 Request Entity Too Large</h1></center>
<hr><center>nginx/1.25.2</center>
</body>
</html>
* Connection #0 to host localhost left intact
*   Trying 127.0.0.1:8914...
* Connected to localhost (127.0.0.1) port 8914 (#0)
> PUT /?i=2 HTTP/1.1
> Host: localhost:8914
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 15000000
> Content-Type: application/x-www-form-urlencoded
>
* We are completely uploaded and fine
< HTTP/1.1 413 Request Entity Too Large
< Server: nginx/1.25.2
< Date: Sun, 10 Sep 2023 23:14:51 GMT
< Content-Type: text/html
< Content-Length: 183
< Connection: keep-alive
< Age: 0
<
<html>
<head><title>413 Request Entity Too Large</title></head>
<body>
<center><h1>413 Request Entity Too Large</h1></center>
<hr><center>nginx/1.25.2</center>
</body>
</html>
* Connection #0 to host localhost left intact
*   Trying 127.0.0.1:8914...
* Connected to localhost (127.0.0.1) port 8914 (#0)
> PUT /?i=3 HTTP/1.1
> Host: localhost:8914
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 15000000
> Content-Type: application/x-www-form-urlencoded
>
* We are completely uploaded and fine
< HTTP/1.1 413 Request Entity Too Large
< Server: nginx/1.25.2
< Date: Sun, 10 Sep 2023 23:14:51 GMT
< Content-Type: text/html
< Content-Length: 183
< Connection: keep-alive
< Age: 0
<
<html>
<head><title>413 Request Entity Too Large</title></head>
<body>
<center><h1>413 Request Entity Too Large</h1></center>
<hr><center>nginx/1.25.2</center>
</body>
</html>
* Connection #0 to host localhost left intact
*   Trying 127.0.0.1:8914...
* Connected to localhost (127.0.0.1) port 8914 (#0)
> PUT /?i=4 HTTP/1.1
> Host: localhost:8914
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 15000000
> Content-Type: application/x-www-form-urlencoded
>
* We are completely uploaded and fine
< HTTP/1.1 413 Request Entity Too Large
< Server: nginx/1.25.2
< Date: Sun, 10 Sep 2023 23:14:51 GMT
< Content-Type: text/html
< Content-Length: 183
< Connection: keep-alive
< Age: 0
<
<html>
<head><title>413 Request Entity Too Large</title></head>
<body>
<center><h1>413 Request Entity Too Large</h1></center>
<hr><center>nginx/1.25.2</center>
</body>
</html>
* Connection #0 to host localhost left intact
*   Trying 127.0.0.1:8914...
* Connected to localhost (127.0.0.1) port 8914 (#0)
> PUT /?i=5 HTTP/1.1
> Host: localhost:8914
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 15000000
> Content-Type: application/x-www-form-urlencoded
>
* We are completely uploaded and fine
< HTTP/1.1 413 Request Entity Too Large
< Server: nginx/1.25.2
< Date: Sun, 10 Sep 2023 23:14:52 GMT
< Content-Type: text/html
< Content-Length: 183
< Connection: keep-alive
< Age: 0
<
<html>
<head><title>413 Request Entity Too Large</title></head>
<body>
<center><h1>413 Request Entity Too Large</h1></center>
<hr><center>nginx/1.25.2</center>
</body>
</html>
* Connection #0 to host localhost left intact

Unexpected Behavior: Traffic Server 9.2.x

In both versions of Traffic Server 9.2.x, you'll sometimes get the expected 413 Request Entity Too Large error back, but then a decent number of 502 Bad Gateway errors will also be generated by the nginx proxy layer. The nginx proxy layer reports errors like the following (seemingly indicating that the connection to Traffic Server has been closed unexpectedly):

writev() failed (104: Connection reset by peer) while sending request to upstream, client: 172.27.0.1, server: , request: "PUT /?i=3 HTTP/1.1", upstream: "http://172.27.0.5:8080/?i=3", host: "localhost:8922"

*   Trying 127.0.0.1:8922...
* Connected to localhost (127.0.0.1) port 8922 (#0)
> PUT /?i=1 HTTP/1.1
> Host: localhost:8922
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 15000000
> Content-Type: application/x-www-form-urlencoded
> 
* We are completely uploaded and fine
< HTTP/1.1 502 Bad Gateway
< Server: nginx/1.25.2
< Date: Sun, 10 Sep 2023 23:16:22 GMT
< Content-Type: text/html
< Content-Length: 157
< Connection: keep-alive
< 
<html>
<head><title>502 Bad Gateway</title></head>
<body>
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/1.25.2</center>
</body>
</html>
* Connection #0 to host localhost left intact
*   Trying 127.0.0.1:8922...
* Connected to localhost (127.0.0.1) port 8922 (#0)
> PUT /?i=2 HTTP/1.1
> Host: localhost:8922
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 15000000
> Content-Type: application/x-www-form-urlencoded
> 
* We are completely uploaded and fine
< HTTP/1.1 413 Request Entity Too Large
< Server: nginx/1.25.2
< Date: Sun, 10 Sep 2023 23:16:23 GMT
< Content-Type: text/html
< Content-Length: 183
< Connection: keep-alive
< Age: 0
< 
<html>
<head><title>413 Request Entity Too Large</title></head>
<body>
<center><h1>413 Request Entity Too Large</h1></center>
<hr><center>nginx/1.25.2</center>
</body>
</html>
* Connection #0 to host localhost left intact
*   Trying 127.0.0.1:8922...
* Connected to localhost (127.0.0.1) port 8922 (#0)
> PUT /?i=3 HTTP/1.1
> Host: localhost:8922
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 15000000
> Content-Type: application/x-www-form-urlencoded
> 
* We are completely uploaded and fine
< HTTP/1.1 502 Bad Gateway
< Server: nginx/1.25.2
< Date: Sun, 10 Sep 2023 23:16:23 GMT
< Content-Type: text/html
< Content-Length: 157
< Connection: keep-alive
< 
<html>
<head><title>502 Bad Gateway</title></head>
<body>
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/1.25.2</center>
</body>
</html>
* Connection #0 to host localhost left intact
*   Trying 127.0.0.1:8922...
* Connected to localhost (127.0.0.1) port 8922 (#0)
> PUT /?i=4 HTTP/1.1
> Host: localhost:8922
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 15000000
> Content-Type: application/x-www-form-urlencoded
> 
* We are completely uploaded and fine
< HTTP/1.1 502 Bad Gateway
< Server: nginx/1.25.2
< Date: Sun, 10 Sep 2023 23:16:23 GMT
< Content-Type: text/html
< Content-Length: 157
< Connection: keep-alive
< 
<html>
<head><title>502 Bad Gateway</title></head>
<body>
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/1.25.2</center>
</body>
</html>
* Connection #0 to host localhost left intact
*   Trying 127.0.0.1:8922...
* Connected to localhost (127.0.0.1) port 8922 (#0)
> PUT /?i=5 HTTP/1.1
> Host: localhost:8922
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 15000000
> Content-Type: application/x-www-form-urlencoded
> 
* We are completely uploaded and fine
< HTTP/1.1 502 Bad Gateway
< Server: nginx/1.25.2
< Date: Sun, 10 Sep 2023 23:16:23 GMT
< Content-Type: text/html
< Content-Length: 157
< Connection: keep-alive
< 
<html>
<head><title>502 Bad Gateway</title></head>
<body>
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/1.25.2</center>
</body>
</html>
* Connection #0 to host localhost left intact

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