503, Service Unavailable error was encountered while trying to use an ErrorDocument to handle the request - http-status-code-503

Sometimes the following error appears:
Service Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
Additionally, a 503 Service Unavailable error was encountered while trying to use an ErrorDocument to handle the request.
How can I fix it?

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jhipster gateway: Error during WebSocket handshake: Unexpected response code: 403

Used jhipster to create gateway. I use UAA for authorization. I didn't change any settings. Getting an error :( Maybe I need to add something else that wasn't done in the generation process?
URL: wss://**.com/websocket/tracker/883/jj2yk045/websocket
Cookie with access_token, session_token and XSRF-TOKEN.
Message: Error during WebSocket handshake: Unexpected response code: 403
The app was started with TLS disabled. This uses Nginx. After TLS enabled work fine.

An Error occurred delivering to the app store

I am trying to release my project to the app store. However I get this error:
'An Error occurred delivering to the app store.'
First I tried to release it directly from Xcode. Following the advice I found on here, I then tried it using Transporter. The same error occurred but I got an extended delivery log:
[2019-10-29 14:04:49 WITA] INFO: An error occurred checking the HEAD for: https://contentdelivery.itunes.apple.com/transporter/repositories/j2se8/latest/repository.xml Unable to tunnel through proxy. Proxy returns "HTTP/1.1 502 Bad Gateway" Exception's name: java.io.IOException, Exception's message: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 502 Bad Gateway"
Can someone help me fix this or point me in the right direction please, as I'm pretty lost with it.
Many thanks
Try following
Go to Preferences > Network > Advanced > Proxies and make sure "Auto Proxy Discovery" and "Automatic Proxy Configuration" are checked but none of the other proxy options are checked.

502 Bad Gateway: Registered endpoint failed to handle the request

I am using this link: http://blog.ibmjstart.net/2015/08/10/drupal-container-on-ibm-bluemix/ to install a Drupal application. But when I try to start the application this message displays: 502 Bad Gateway: Registered endpoint failed to handle the request.
What do I have to change to prevent the 502 error?

Git push error, fatal: HTTP request failed

I have been working on this rails project for weeks (it is deployed using Heroku), pushing to GitHub frequently without a problem. I am now getting this error:
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https://github.com/my_git_name/my_repository_name.git/info/refs?service=git-receive-pack
fatal: HTTP request failed
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I have already seen that 504 error message in conjunction with GitHub trouble.
And that seems consistent with last night GitHub status message:
21:51 UTC We are currently working to resolve problems affecting a subset of repositories on a single fileserver.
So, if the error message is now gone, that would confirm the possibility of a server-side (GitHub) issue, as opposed to a more permanent client-side problem.

On bundle install showing error : `fetch_http': bad response Service Unavailable 503

In command prompt when I run bundle install
I got an error showing there
`fetch_http': bad response Service Unavailable 503
If anybody else faced such error before?
#ruby,
I suppose there will be some problem with your Internet connection. Please recheck your connection.
Or any plugin/gem is unfetchable.
503 ->Service Unavailable
That means:
Server cannot respond due to maintenance or overloading. For example, a servlet might return this header if some thread or database connection pool is currently full. Server can supply a Retry-After header.

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