Some links to HTTP/2 servers fail

[wjdp]

http://www.southampton.ac.uk/maths/about/staff/tim.page

<a href="http://www.southampton.ac.uk/maths/about/staff/tim.page">Tim</a>

~/tmp ❯ htmltest test.html -l 0
htmltest started at 10:17:31 on .
========================================================================
0: DirectoryPath string = .
1: DirectoryIndex string = index.html
2: FilePath string = test.html
3: FileExtension string = .html
4: CheckDoctype bool = true
5: CheckAnchors bool = true
6: CheckLinks bool = true
7: CheckImages bool = true
8: CheckScripts bool = true
9: CheckMeta bool = true
10: CheckGeneric bool = true
11: CheckExternal bool = true
12: CheckInternal bool = true
13: CheckInternalHash bool = true
14: CheckMailto bool = true
15: CheckTel bool = true
16: CheckFavicon bool = false
17: CheckMetaRefresh bool = true
18: EnforceHTML5 bool = false
19: EnforceHTTPS bool = false
20: IgnoreURLs []interface {} = []
21: IgnoreDirs []interface {} = []
22: IgnoreInternalEmptyHash bool = false
23: IgnoreCanonicalBrokenLinks bool = true
24: IgnoreAltMissing bool = false
25: IgnoreDirectoryMissingTrailingSlash bool = false
26: IgnoreTagAttribute string = data-proofer-ignore
27: TestFilesConcurrently bool = false
28: DocumentConcurrencyLimit int = 128
29: HTTPConcurrencyLimit int = 16
30: LogLevel int = 0
31: LogSort string = document
32: ExternalTimeout int = 15
33: StripQueryString bool = true
34: StripQueryExcludes []string = [fonts.googleapis.com]
35: EnableCache bool = true
36: EnableLog bool = true
37: OutputDir string = tmp/.htmltest
38: OutputCacheFile string = refcache.json
39: OutputLogFile string = htmltest.log
40: CacheExpires string = 336h
41: NoRun bool = false
test.html
  missing doctype --- test.html --> <nil>
  fresh --- test.html --> http://www.southampton.ac.uk/maths/about/staff/tim.page
  hitting --- test.html --> http://www.southampton.ac.uk/maths/about/staff/tim.page
  request exceeded our ExternalTimeout --- test.html --> http://www.southampton.ac.uk/maths/about/staff/tim.page
========================================================================
✘✘✘ failed in 15.000928197s
2 errors

Same machine/network straight after:

~/tmp ❯ curl -v https://www.southampton.ac.uk/maths/about/staff/tim.page
*   Trying 152.78.118.52...
* Connected to www.southampton.ac.uk (152.78.118.52) port 443 (#0)
* found 173 certificates in /etc/ssl/certs/ca-certificates.crt
* found 697 certificates in /etc/ssl/certs
* ALPN, offering http/1.1
* SSL connection using TLS1.2 / ECDHE_RSA_AES_256_GCM_SHA384
* 	 server certificate verification OK
* 	 server certificate status verification SKIPPED
* 	 common name: www.southampton.ac.uk (matched)
* 	 server certificate expiration date OK
* 	 server certificate activation date OK
* 	 certificate public key: RSA
* 	 certificate version: #3
* 	 subject: OU=Domain Control Validated,CN=www.southampton.ac.uk
* 	 start date: Tue, 13 Jan 2015 00:00:00 GMT
* 	 expire date: Fri, 12 Jan 2018 23:59:59 GMT
* 	 issuer: C=NL,ST=Noord-Holland,L=Amsterdam,O=TERENA,CN=TERENA SSL CA 2
* 	 compression: NULL
* ALPN, server did not agree to a protocol
> GET /maths/about/staff/tim.page HTTP/1.1
> Host: www.southampton.ac.uk
> User-Agent: curl/7.47.0
> Accept: */*
> 
< HTTP/1.1 200 OK
< Server: nginx
< Date: Wed, 02 Aug 2017 21:18:18 GMT
< Content-Type: text/html;charset=UTF-8
< Transfer-Encoding: chunked
< Connection: keep-alive
< Set-Cookie: JSESSIONID=49E6AA99A8499F109C6E4E09F5FD4018; Path=/; HttpOnly
< X-XSS-Protection: 1; mode=block
< X-Frame-Options: SAMEORIGIN
< X-Content-Type-Options: nosniff
< Referrer-Policy: unsafe-url
< Content-Security-Policy-Report-Only: default-src 'self' 'unsafe-inline' *.atbar.org *.issuu.com ddfbm2kt5ml6l.cloudfront.net cdn.soton.ac.uk cdn.southampton.ac.uk corporate.wordpress.soton.ac.uk blog.soton.ac.uk; script-src 'self' 'unsafe-inline' 'unsafe-eval' code.jquery.com www.googleadservices.com www.googletagmanager.com *.google-analytics.com connect.facebook.net static.ads-twitter.com j.flxpxl.com hj.flxpxl.com d2hlpp31teaww3.cloudfront.net d1d7fjtb6d4i2m.cloudfront.net analytics.twitter.com ib.adnxs.com www.intelliworkschat.com access.ecs.soton.ac.uk *.atbar.org www.youtube.com s.ytimg.com *.issuu.com ddfbm2kt5ml6l.cloudfront.net cdn.soton.ac.uk cdn.southampton.ac.uk stats.wp.com soton.disqus.com stats.wp.com corporate.wordpress.soton.ac.uk blog.soton.ac.uk s0.wp.com use.typekit.net connect.facebook.com platform.twitter.com; font-src 'self' data: ddfbm2kt5ml6l.cloudfront.net cdn.soton.ac.uk cdn.southampton.ac.uk use.typekit.net; img-src data: 'self' www.southampton.ac.uk cdn.soton.ac.uk cdn.southampton.ac.uk t.co mpp2.vindicosuite.com *.google-analytics.com *.facebook.com pixel.adsafeprotected.com *.doubleclick.net www.google.com www.google.co.uk *.atbar.org *.issuu.com image.isu.pub www.intelliworkschat.com pixel.wp.com blog.soton.ac.uk platform.twitter.com pbs.twimg.com syndication.twitter.com p.typekit.net d1d7fjtb6d4i2m.cloudfront.net; frame-src 'self' www.google.com www.google.co.uk www.youtube.com *.issuu.com ddfbm2kt5ml6l.cloudfront.net cdn.soton.ac.uk cdn.southampton.ac.uk; child-src 'self' www.google.com www.google.co.uk www.youtube.com *.issuu.com ddfbm2kt5ml6l.cloudfront.net cdn.soton.ac.uk cdn.southampton.ac.uk;
< Set-Cookie: BIGipServer~CorpWeb~pool-corpweb-prod-80=2695407808.20480.0000; path=/; Httponly; Secure
< 
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">

[wjdp]

Is an occurrence of golang/go#20979