I can't access http server for fetching data - reactjs

I am building simple project with MERN.
Is there anybody who knows what kind of this issue is?
When I run my project locally, there wasn't such that issue.
But after I deployed it to IONOS, I met this error.
Please help me with this issue.

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It was just a stupid mistake, so never mind. Sorry.

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I'm encountering a probem with my GWT app. Everything is working great in local but I got Error 500 when the application is deployed on Google App Engine.
To understand the problem, I tried to deploy the sample Web Application example with Greetings service and I still got the same error Remote Procedure Call - Failure.
I think it's coming from my IDE settings but can't figure out what is the problem.
Can anyone help ?
The problem you are facing is with ONLY servlet paths .
The environment and the folder structure will be cmpletely different in Dev-Mode and Deployment environment .
In The below link ,explained the problem you are facing.
Eclipse GWT sample greeting project RPC failure .

Eclipse error on deploying AppEngine project

I am using the Eclipse with the Google AppEngine plugins (Java) and following the http://code.google.com/appengine/docs/java/gettingstarted/uploading.html tutorial.
Everything works fine locally, but when I try to deploy to AppEngine I get an error
"Error While signing in"
An error occurred while trying to sign in 400 bad request. See the error logs for more details.
This error is before I enter any login info or anything.
I am copy/pasting the App ID from the AppEngine website so Im pretty sure I got it right.
I have no idea where the logs are on this thing, so any help there would also be appreciated.
Try logging out and back in again. That worked for me.
Change your proxy settings!
Please go to Window -> Preferences
Then from General find Network Connections and update your proxy settings.
This must solve your issue.

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