I am experiencing an issue in Safari only where sites loaded over http/2 on our Apache 2.4 servers will intermittently (every 3-5 requests) fail to load certain resources. The pages always seem to load, but the JS, CSS, and images seem to fail. I will see the error Failed to load resource: The network connection was lost. in the console and occasionally an Unexpected end of script error. If I load the JS directly, every 3-5 requests only about 3/5 of the file will load and no error will be thrown. If I disable http/2, everything works as expected. All of the sites are running with Let's Encrypt certs.
Is there a solution to this issue? As an alternative, is it possible to use BrowserMatch to disable http2 for just Safari? While that isn't the ideal solution, it is preferable to sites being unable to load half their resources in Safari. I've never had to use BrowserMatch before, though, and I am unsure of what the syntax would be.
Config info:
Debian version: 9.6
Server version: Apache/2.4.25 (Debian)
Server built: 2018-11-03T18:46:19
Protocols h2 h2c http/1.1
PHP7.0 and PHP7.2 running with FPM
Loaded Modules:
core_module (static)
so_module (static)
watchdog_module (static)
http_module (static)
log_config_module (static)
logio_module (static)
version_module (static)
unixd_module (static)
access_compat_module (shared)
actions_module (shared)
alias_module (shared)
auth_basic_module (shared)
authn_core_module (shared)
authn_file_module (shared)
authz_core_module (shared)
authz_host_module (shared)
authz_user_module (shared)
autoindex_module (shared)
deflate_module (shared)
dir_module (shared)
env_module (shared)
expires_module (shared)
filter_module (shared)
http2_module (shared)
mime_module (shared)
mpm_event_module (shared)
negotiation_module (shared)
proxy_module (shared)
proxy_fcgi_module (shared)
reqtimeout_module (shared)
rewrite_module (shared)
setenvif_module (shared)
socache_shmcb_module (shared)
ssl_module (shared)
status_module (shared)
vhost_alias_module (shared)
Example of Failed Network Request:
Summary
URL: https://www.example.com/wp-content/themes/example/app/scripts.min.js
Status: 200
Source: Network
Address: 111.111.111.111:443
Request
:method: GET
:scheme: https
:authority: www.example.com
:path: /wp-content/themes/example/app/scripts.min.js
Cookie: _ga=GA1.2.693564551.1543614967; _gid=GA1.2.1931614765.1543937949; _gat_gtag_UA_127993364_1=1
Accept: */*
Cache-Control: max-age=0
Accept-Language: en-us
If-None-Match: "45da3-57c343a615009-gzip"
Host: www.tahv.org
If-Modified-Since: Tue, 04 Dec 2018 15:50:43 GMT
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0 Safari/605.1.15
Referer: https://www.example.com/
Accept-Encoding: br, gzip, deflate
Connection: keep-alive
Response
:status: 200
Content-Type: application/javascript
Expires: Fri, 07 Dec 2018 16:31:14 GMT
Last-Modified: Tue, 04 Dec 2018 15:50:43 GMT
Vary: Accept-Encoding
Accept-Ranges: bytes
Date: Tue, 04 Dec 2018 16:31:14 GMT
Content-Encoding: gzip
Cache-Control: max-age=259200
ETag: "45da3-57c343a615009-gzip"
Server: Apache/2.4.25 (Debian)
