Go HTTP Client Connection Reuse: Common Misconceptions

The Go HTTP client is designed to reuse connections by default, offering efficient network utilization. However, certain scenarios can lead to misconceptions about connection reuse.

Original Query: Infinite Connection Creation

In the given code, it initially appears that an infinite number of connections are being created. However, this issue is resolved by closing the request body after receiving the response. This allows the transport to recognize that the connection can be reused for subsequent requests.

Importance of Closing Response Body

To ensure connection reuse, it is crucial to both read until the response is complete and then close the response body. Closing the body signals to the transport that the connection can be reused.

Additional Considerations

Despite the default connection reuse mechanism, there may be scenarios where specific requirements dictate limiting the number of connections to a particular host. Unfortunately, the Go HTTP client does not provide a configuration option for this purpose.

Alternative Rate Limiting Strategy

If rate limiting connections is a necessity, an alternative approach is to throttle the rate at which the Go routine is called. This can be achieved using a time.Tick channel, which allows for the control of requests per second.

Conclusion

The Go HTTP client supports connection reuse by default, but proper handling of the response body is essential to ensure efficient network utilization. In cases where rate limiting is required, consider using a separate throttling mechanism.