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Badges in github cached aggressively

See original GitHub issue

I have noticed that badgen images are cached aggresively in github README.md pages. Github does not show the newest image (e.g. after the travis build is now successful).

I assume that the headers set for badgen images are not compliant with the expectations in github markdown rendering.

Please compare the headers of the badgen image with the travis image (showing correctly in github). Note especially the missing ETag and different Cache-Control headers.

Request URL: https://badgen.net/travis/eobermuhlner/jshell-scriptengine
Request Method: GET
Status Code: 200 
Remote Address: 34.65.177.142:443
Referrer Policy: no-referrer-when-downgrade
accept-ranges: bytes
cache-control: public, max-age=60, s-maxage=10800, stale-while-revalidate=604800, stale-if-error=604800
content-length: 909
content-type: image/svg+xml;charset=utf-8
date: Sat, 10 Aug 2019 20:20:04 GMT
server: now
status: 200
strict-transport-security: max-age=63072000
x-now-id: zrh1:5tsbk-1565468404305-f7b54989b944
x-now-instance: 2086726134
x-now-trace: zrh1,bru1
:authority: badgen.net
:method: GET
:path: /travis/eobermuhlner/jshell-scriptengine
:scheme: https
accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
accept-encoding: gzip, deflate, br
accept-language: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7,pt;q=0.6
cache-control: max-age=0
cookie: _ga=GA1.2.1998362482.1565447264; _gid=GA1.2.1005516287.1565447264
upgrade-insecure-requests: 1
user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36

Request URL: https://api.travis-ci.org/eobermuhlner/jshell-scriptengine.svg?branch=master
Request Method: GET
Status Code: 304 Not Modified
Remote Address: 50.19.95.74:443
Referrer Policy: no-referrer-when-downgrade
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: *
Access-Control-Expose-Headers: Content-Type, Cache-Control, Expires, Etag, Last-Modified, X-Request-ID
Cache-Control: no-cache, private
Connection: keep-alive
Content-Length: 0
Date: Sat, 10 Aug 2019 20:21:34 GMT
Etag: "2846a7d1dcb3a21c0cc9c9216fd307b7"
Server: nginx
Strict-Transport-Security: max-age=31536000
Vary: Accept
Via: 1.1 vegur
X-Accepted-Oauth-Scopes: public
X-Endpoint: Travis::Api::App::Endpoint::RepoStatus
X-Oauth-Scopes: public
X-Pattern: /:owner_name/:name
X-Rack-Cache: miss
X-Request-Id: c5895a1d-10d4-4912-94eb-e1d29e7cc233
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Accept-Encoding: gzip, deflate, br
Accept-Language: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7,pt;q=0.6
Cache-Control: max-age=0
Connection: keep-alive
Cookie: __utmc=32124027; __utmz=32124027.1565464132.12.7.utmcsr=github.com|utmccn=(referral)|utmcmd=referral|utmcct=/eobermuhlner/jshell-scriptengine; __utma=32124027.314419808.1551556926.1565464132.1565468467.13; __utmt=1; __utmb=32124027.1.10.1565468467
Host: api.travis-ci.org
If-Modified-Since: Sat, 10 Aug 2019 17:56:03 GMT
If-None-Match: "2846a7d1dcb3a21c0cc9c9216fd307b7"
Referer: https://travis-ci.org/eobermuhlner/jshell-scriptengine
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36
branch: master