How Can I Efficiently Reuse HTTP Connections in Go to Improve Performance?

Reusing HTTP Connections in Go: The Complete Guide

Reusing HTTP connections is crucial for optimizing performance and reducing server load. In Go, connection reuse is not automatic, so it's important to configure your transport and client correctly to achieve it.

Problem: Multiple Concurrent Connections

When making HTTP POST requests using the default transport and client, you may notice that a new connection is created for each request. This can result in a large number of concurrent connections, which is inefficient and can lead to performance issues.

Solution: Ensure Response Completion and Closing

To reuse connections, you need to ensure that the response is fully read and the Body is closed. This signals to the transport that the connection is available for reuse. Here is the correct approach:

1. Make a request using the client.
2. Read the response body into a buffer (e.g., using ioutil.ReadAll(resp.Body)):

res, _ := client.Do(req)
_, err := ioutil.ReadAll(res.Body)
if err != nil {
    // Handle error
}

3. Close the response body:

res.Body.Close()

Key Points

• To ensure connection reuse, you must read until the response is complete (i.e., ioutil.ReadAll(resp.Body)).
• You must call Body.Close() on the response to signal connection availability.

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