Why Does \'getaddrinfo failed\' Prevent My BottlePy App From Working?

Unable to Resolve Hostname: Understanding the "getaddrinfo failed" Error

The "getaddrinfo failed" error, as the message suggests, indicates a failure in resolving a hostname. This commonly occurs when a program attempts to establish a network connection using a provided hostname that cannot be translated into an IP address.

In the context of the BottlePy documentation example, the error is encountered when deploying the "hello world" application. The error message stems from the "getaddrinfo()" function within the underlying Python socket library. This function attempts to retrieve the address information associated with a given hostname, but in this instance, the hostname cannot be resolved, resulting in the error.

The problem typically arises due to one of two reasons:

1. Invalid Hostname: The hostname specified in the "getaddrinfo()" call may be invalid or mistyped. Verify the hostname and ensure that it correctly represents the intended destination.
2. DNS Resolution Issue: The Domain Name System (DNS) servers responsible for translating hostnames into IP addresses may be unavailable, overloaded, or misconfigured. This can prevent the hostname resolution process from completing successfully.

To resolve this error, try the following troubleshooting steps:

• Ensure the hostname is correct by double-checking its spelling and syntax.
• If using 'localhost', try using '127.0.0.1' instead, as 'localhost' may not be recognized by your DNS server.
• Verify that your DNS servers are operational and configured correctly.
• Consider using a different hostname or contacting the network administrator for assistance.

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