Hi Cyril,
Thank you so much for your response. [1] is the simplest example of our 503
errorfile. Based on what you're saying it sounds like we need to add some
additional information into the file. Is this documented somewhere?
[1]
<html>
<head>
<title>HTTP 503</title>
</head>
<body style="font-family:Arial,Helvetica,sans-serif;">
<div style="margin: 0 auto; width: 960px;">
<h2 >Author is unavailable</h2>
<p>
Either the instance is temporarily unavailable, down or being restarted. If
this issue persists, please <a href="REMOVED">file a ticket</a>
<br />
<pre>
W W W
W W W W
'. W
.-""-._ \ \.--|
/ "-..__) .-'
| _ /
\'-.__, .__.,'
`'----'._\--'
VVVVVVVVVVVVVVVVVVVVV
</pre>
</div>
</body>
</html>
-----Original Message-----
From: Cyril Bonté [mailto:[email protected]]
Sent: Monday, June 11, 2018 4:37 PM
To: J. Casalino <[email protected]>
Cc: [email protected]
Subject: Re: HAProxy 1.8.x not serving errorfiles with H2
Hi,
Le 11/06/2018 à 16:39, J. Casalino a écrit :
> Trying again - has anyone else seen this?
>
> *From:* J. Casalino [mailto:[email protected]]
> *Sent:* Tuesday, June 5, 2018 12:27 PM
> *To:* [email protected]
> *Subject:* HAProxy 1.8.x not serving errorfiles with H2
>
> We are in the process of testing HAProxy 1.8.x with ALPN and H2 on
> some of our servers. We have default 502 and 503 errorfiles defined (ex.
> errorfile 503 /etc/haproxy/errors/503.http), but we've noticed that
> these errorfiles are not served to the user's browser when the error
> occurs (for instance, if the backend is down, a user should get the
> 503 errorfile).
>
> Chrome returns "ERR_SPDY_PROTOCOL_ERROR", Curl [1] returns "curl: (92)
> HTTP/2 stream 1 was not closed cleanly: INTERNAL_ERROR (err 2)", and
> Firefox shows "The connection to <servername> was interrupted while
> the page was loading."
>
> With debug logging turned on, I can see that HAProxy is recognizing a
> 503 if the back-end server is down [2], but it doesn't seem to pass
> that error through to the client browser. If the backend is up and a
> 502 is generated, users do not receive the errorfile either. If we
> turn off H2 and drop back to HTTP/1.1, the errorfiles are displayed
> properly (though via HTTP/0.9)
If it looks like HTTP/0.9, I tend to think that your errorfile is not properly
set. Such files must contain the status line, the headers and the response body.
And indeed, from a quick test, if I remove the status line, I get the same
error with a HTTP/2 request. Once the file is correctly defined, everything is
OK.
Can you provide the content of your errorfile(s) ?
> This has been observed in both 1.8.4 and 1.8.9. Our platform is Amazon
> Linux, using openssl-1.0.2k-12.109.amzn1.x86_64.
>
> Thanks in advance for any thoughts you might have -
>
> [1]
>
> Curl verbose (curl -vvvvI) output:
>
> * Trying <ipaddr>...
>
> * TCP_NODELAY set
>
> * Connected to <servername> (<ipaddr>) port 443 (#0)
>
> * ALPN, offering h2
>
> * ALPN, offering http/1.1
>
> * Cipher selection:
> ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
>
> * successfully set certificate verify locations:
>
> * CAfile: /etc/ssl/cert.pem
>
> CApath: none
>
> * TLSv1.2 (OUT), TLS handshake, Client hello (1):
>
> * TLSv1.2 (IN), TLS handshake, Server hello (2):
>
> * TLSv1.2 (IN), TLS handshake, Certificate (11):
>
> * TLSv1.2 (IN), TLS handshake, Server key exchange (12):
>
> * TLSv1.2 (IN), TLS handshake, Server finished (14):
>
> * TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
>
> * TLSv1.2 (OUT), TLS change cipher, Client hello (1):
>
> * TLSv1.2 (OUT), TLS handshake, Finished (20):
>
> * TLSv1.2 (IN), TLS change cipher, Client hello (1):
>
> * TLSv1.2 (IN), TLS handshake, Finished (20):
>
> * SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
>
> * ALPN, server accepted to use h2
>
> * Server certificate:
>
> * subject: [removed]
>
> * start date: Mar 20 00:00:00 2017 GMT
>
> * expire date: Mar 24 12:00:00 2020 GMT
>
> * subjectAltName: host "<hostname>" matched cert's "<certname>"
>
> * issuer: C=US; O=DigiCert Inc; CN=DigiCert SHA2 Secure Server CA
>
> * SSL certificate verify ok.
>
> * Using HTTP2, server supports multi-use
>
> * Connection state changed (HTTP/2 confirmed)
>
> * Copying HTTP/2 data in stream buffer to connection buffer after
> upgrade: len=0
>
> * Using Stream ID: 1 (easy handle 0x7fbded005400)
>
> > HEAD /libs/cq/core/content/welcome.html HTTP/2
>
> > Host: <hostname>
>
> > User-Agent: curl/7.54.0
>
> > Accept: */*
>
> >
>
> * Connection state changed (MAX_CONCURRENT_STREAMS updated)!
>
> * HTTP/2 stream 1 was not closed cleanly: INTERNAL_ERROR (err 2)
>
> * Closing connection 0
>
> * TLSv1.2 (OUT), TLS alert, Client hello (1):
>
> curl: (92) HTTP/2 stream 1 was not closed cleanly: INTERNAL_ERROR (err
> 2)
>
> [2] haproxy[19803]: <ipaddr>:63832 [05/Jun/2018:15:36:24.202]
> incoming_https~ local_author_app_http/<NOSRV> 0/-1/-1/-1/0 503 1441 -
> - SCDN 3/1/0/0/0 0/0 "GET /libs/cq/core/content/welcome.html HTTP/1.1"
>
--
Cyril Bonté
