在Golang中重用HTTP连接

Question

I'm currently struggling to find a way to reuse connections when making HTTP posts in Golang.

I've created a transport and client like so:

// Create a new transport and HTTP client
tr := &http.Transport{}
client := &http.Client{Transport: tr}

I'm then passing this client pointer into a goroutine which is making multiple posts to the same endpoint like so:

r, err := client.Post(url, "application/json", post)

Looking at netstat this appears to be resulting in a new connection for every post resulting in a large number of concurrent connections being open.

What is the correct way to reuse connections in this case?

Answer 1

IIRC, the default client does reuse connections. Are you closing the response?

Callers should close resp.Body when done reading from it. If resp.Body is not closed, the Client's underlying RoundTripper (typically Transport) may not be able to re-use a persistent TCP connection to the server for a subsequent "keep-alive" request.