I am occasionally unable to download <https://releases.wikimedia.org/mediawiki/1.26/mediawiki-1.26.2.tar.gz> (current MediaWiki release linked from https://www.mediawiki.org/wiki/Download). Sometimes it works fine, sometimes it returns a zero-byte response. This was first reported on `#mediawiki` by KDDLB.
`curl -I https://releases.wikimedia.org/mediawiki/1.26/mediawiki-1.26.2.tar.gz`
Example response headers (bad)
```
HTTP/1.1 200 OK
Date: Wed, 11 May 2016 19:40:30 GMT
Content-Type: application/x-gzip
Content-Length: 0
Connection: keep-alive
Server: Apache
ETag: "18026c7-5275e33fa3d00"
Last-Modified: Mon, 21 Dec 2015 01:13:56 GMT
Backend-Timing: D=304 t=1462988431650045
X-Varnish: 4106268 42887, 19455418, 4857682
Age: 152
Via: 1.1 varnish-v4, 1.1 varnish-v4, 1.1 varnish-v4
Age: 152
Accept-Ranges: bytes
Age: 152
X-Cache: cp1045 hit(4), cp3007 miss(0), cp3008 frontend miss(0)
Strict-Transport-Security: max-age=31536000
Set-Cookie: WMF-Last-Access=11-May-2016;Path=/;HttpOnly;secure;Expires=Sun, 12 Jun 2016 12:00:00 GMT
X-Analytics: https=1;nocookies=1
X-Client-IP: 91.218.200.230
Accept-Ranges: bytes
```
Example response headers (good)
```
HTTP/1.1 200 OK
Date: Wed, 11 May 2016 19:41:08 GMT
Content-Type: application/x-gzip
Content-Length: 25175751
Connection: keep-alive
Server: Apache
ETag: "18026c7-5275e33fa3d00"
Last-Modified: Mon, 21 Dec 2015 01:13:56 GMT
Backend-Timing: D=304 t=1462988431650045
X-Varnish: 368674 42887, 19377459 18598167, 16596255
Via: 1.1 varnish-v4, 1.1 varnish-v4, 1.1 varnish-v4
Age: 190
Accept-Ranges: bytes
Age: 190
X-Cache: cp1045 hit(1), cp3010 hit(1), cp3008 frontend pass(0)
Strict-Transport-Security: max-age=31536000
Set-Cookie: WMF-Last-Access=11-May-2016;Path=/;HttpOnly;secure;Expires=Sun, 12 Jun 2016 12:00:00 GMT
X-Analytics: https=1;nocookies=1
X-Client-IP: 91.218.200.230
Accept-Ranges: bytes
```
All of the bad responses I've seen so far have `X-Cache: cp1045 hit(4), cp3007 miss(0), cp3008 frontend miss(0)`.
Word diff `wdiff bad good|colordiff`:
{F3996796 size=full}
Unified diff:
```
--- bad 2016-05-11 21:57:43.000000000 +0200
+++ good 2016-05-11 21:57:51.000000000 +0200
@@ -1,21 +1,20 @@
HTTP/1.1 200 OK
-Date: Wed, 11 May 2016 19:40:30 GMT
+Date: Wed, 11 May 2016 19:41:08 GMT
Content-Type: application/x-gzip
-Content-Length: 0
+Content-Length: 25175751
Connection: keep-alive
Server: Apache
ETag: "18026c7-5275e33fa3d00"
Last-Modified: Mon, 21 Dec 2015 01:13:56 GMT
Backend-Timing: D=304 t=1462988431650045
-X-Varnish: 4106268 42887, 19455418, 4857682
-Age: 152
+X-Varnish: 368674 42887, 19377459 18598167, 16596255
Via: 1.1 varnish-v4, 1.1 varnish-v4, 1.1 varnish-v4
-Age: 152
+Age: 190
Accept-Ranges: bytes
-Age: 152
-X-Cache: cp1045 hit(4), cp3007 miss(0), cp3008 frontend miss(0)
+Age: 190
+X-Cache: cp1045 hit(1), cp3010 hit(1), cp3008 frontend pass(0)
Strict-Transport-Security: max-age=31536000
Set-Cookie: WMF-Last-Access=11-May-2016;Path=/;HttpOnly;secure;Expires=Sun, 12 Jun 2016 12:00:00 GMT
X-Analytics: https=1;nocookies=1
X-Client-IP: 91.218.200.230
Accept-Ranges: bytes
```