Resolving curl: (52) Empty reply from server Error for ejabberd API Commands

Описание: Discover how to troubleshoot and fix the `curl: (52) Empty reply from server` error when working with ejabberd API commands in a Docker setup.
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This video is based on the question https://stackoverflow.com/q/71089099/ asked by the user 'Viral Parmar' ( https://stackoverflow.com/u/578204/ ) and on the answer https://stackoverflow.com/a/71117827/ provided by the user 'Badlop' ( https://stackoverflow.com/u/6039301/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting curl: (52) Empty reply from server with ejabberd API Commands

If you've encountered the error message curl: (52) Empty reply from server while attempting to call ejabberd API commands from a Docker container, you're not alone. This issue can arise when the server is not correctly set up to handle the requests. In this guide, we'll walk through the potential causes of this error and provide solutions to get you back on track.

Understanding the Issue

When you receive the message curl: (52) Empty reply from server, it typically indicates that the server is not responding correctly to the request you're sending via curl. This can occur for a variety of reasons, including misconfigurations in your ejabberd YAML file or network issues within your Docker container.

Common Causes

The server may not be correctly configured to listen on the specified ports.

There could be issues with TLS settings or the required request handlers in the ejabberd configuration.

The API permissions might not allow the requests you're making.

Solution Steps

1. Review Your ejabberd YAML Configuration

To successfully call ejabberd API commands, your YAML configuration should meet specific criteria. Below are the key sections to check in your ejabberd YAML file:

Hosts Configuration

Ensure you have the correct host set up:

[[See Video to Reveal this Text or Code Snippet]]

Listen Configuration

You need to define the ports your server should listen on, including HTTPS and HTTP for the API:

[[See Video to Reveal this Text or Code Snippet]]

2. Set Up API Permissions

To ensure that your API commands are allowed to execute, make sure your api_permissions section includes the necessary permissions for admin access:

[[See Video to Reveal this Text or Code Snippet]]

This sets up the admin access privileges, allowing the user to call registered users from the API.

3. Validate Module Definitions

It's crucial that the mod_http_api module is defined in your configuration. If it's not included, the API requests won't process correctly:

[[See Video to Reveal this Text or Code Snippet]]

4. Testing API Commands

Once you've made the necessary configuration changes, test the API commands using curl. Here's how you can execute both GET and POST commands to retrieve registered users:

GET Command:

[[See Video to Reveal this Text or Code Snippet]]

POST Command:

[[See Video to Reveal this Text or Code Snippet]]

For secure connections, try using HTTPS instead (make sure to use --insecure if you are testing self-signed certificates):

[[See Video to Reveal this Text or Code Snippet]]

5. Monitor ejabberd Logs

Keep an eye on your ejabberd log files after you make these requests. Successful commands should generate log entries similar to this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

If you encounter the curl: (52) Empty reply from server error when trying to make ejabberd API calls, there's usually a misconfiguration in your YAML setup. By ensuring your hosts, listen ports, api_permissions, and modules are correctly configured, you can resolve the issue effectively.

With these troubleshooting steps, you'll be able to successfully interact with your ejabberd server's API from within your Docker container. Happy coding!