Why Am I Still Creating Multiple Connections in My Go HTTP Client Even with `DisableKeepAlives` Set to False?

Troubleshooting Connection Reuse in Go's HTTP Client

Problem: Why does my Go HTTP client create multiple connections to the same host, despite using the DisableKeepAlives option as false?

The Go HTTP client is designed to reuse connections by default. However, there are certain conditions that can prevent it from doing so.

Diagnosis:

In the provided code, the http.Transport.RoundTrip() method is not immediately followed by a call to resp.Close(). This can lead to the connection being closed immediately after the request is sent, preventing it from being reused for subsequent requests.

Solution:

To ensure HTTP connection reuse, two steps are necessary:

1. Read until the response is complete, ensuring that all data is consumed from the response body. Use io.Copy(ioutil.Discard, resp.Body) or ioutil.ReadAll(resp.Body) for this purpose.
2. Call res.Body.Close() to explicitly close the response body, releasing the connection for reuse.

Code Snippet:

<code class="go">res, _ := client.Do(req)
io.Copy(ioutil.Discard, res.Body)
res.Body.Close()</code>

Additional Considerations:

• Setting the DisableKeepAlives option to true explicitly disables connection reuse, regardless of other settings.
• Limiting the number of outbound requests per second can be achieved using techniques like time.Tick. However, this is not specifically related to connection reuse and may not be necessary if connection reuse is functioning correctly.

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