Abnormally closed.

When working with the Binance REST API using WinHTTP, you may encounter a situation where the request fails due to an abnormal connection termination with the server. This error code 12030 usually indicates that the server unexpectedly closed the connection. In this article, we will look at how to force close a connection when receiving such an error.

Understanding Binance REST API Connection

Before diving into the solution to force close a connection, it is necessary to understand how Binance REST API handles connections with WinHTTP. When using WinHTTP as a proxy or in the context of an application, you may need to establish multiple connections to handle different scenarios at the same time. These connections can become clogged after use if not managed properly.

Solution: Force Close the Connection

To force close the connection when you encounter error code 12030, follow these steps:

1. Establish connections and receive information

First, make sure that there are no errors when establishing the connection. If everything goes well, you may want to save or print information about each connection made for analysis purposes.

import requests





Define the API endpoint URL and parameters
url = "

Initialize the dictionary with connection information
connect_details = {
'method': 'GET',
'params': [1, 2, 3], 
Change these values ​​if necessary
}
response = requests.get(url, params=connection_details)
if response.status_code == 200:
print("Connection successful.")
else:
print(f"Failed to establish connection: {response.text}")

2. Close the connection

If an error occurs during the development process and the solution is not immediately obvious, consider closing the connections. This step is crucial to maintaining performance and reducing resource usage.

import axis

Get a list of currently open connections
open_connections = []
i in range (1, 21): 
Replace with a real number or boolean to close all but the specified number
try:
conn_details = {
'method': 'GET',
'params': [i], 
Change values ​​as needed
}
response = requests.get(url + str(i), params=conn_details)
if response.status_code == 200:
print(f"Connection established {i}.")
open_connections.append(conn_details['url'])
except exception like e:

Log the error and continue with another connection
print(f"Failed to establish connection {i}: {str(e)}")

Close the specified number of connections (in this case 18)
url in open_connections[:len(open_connections) - len([conn['url'] for conn in open_connections]) // 2]:
os.system("taskkill /im " + url)
print(f"Connections closed. Remaining: {len(open_connections)}")

Conclusion

Forcing a connection to close is a last resort measure that should be used judiciously to reduce unnecessary resource usage and maintain application performance. Always log errors for troubleshooting purposes to understand the cause of problems encountered when establishing or closing a connection.

Disclaimer: Before implementing this solution in production environments, ensure that your system can handle temporary process termination (e.g. by using Windows Task Manager). Also, be careful when using this method as it may have unintended consequences for your application’s performance.

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