在Golang中为http请求指定网络接口[重复]

Question

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• How to set which IP to use for a HTTP request? 1 answer

I a using go's http package to make http requests. When having several interfaces on Ubuntu Linux, how can I configure go's http client to use a specific interface or IP address to perform the request?

How does the default http client decide which interface it uses?

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Answer 1

Go's http.Client makes requests using a http.RoundTripper. This, in turn, uses a net.Dialer to establish the outbound network connections. net.Dialer has a field LocalAddr which specifies the local address from which the connections will be made. You can use your own Client, with your own RoundTripper, with your own net.Dialer, specifying the LocalAddr you want to use. You can see how each of these is instantiated in the stdlib code linked from the documentation, and copy the mechanisms used to create the default instances to maintain default behavior while overriding the LocalAddr as needed.