How to obtain all request headers in Go

Question

How can I obtain all available http headers from a request as array in Go? I see only the following two methods:

• Header(name string, value string)
• GetHeader(name string)

But in this case I need to know the name of the Header and can't return all existing headers. I'd like to copy the http headers from one request to anther one.

Answer 1

Use Request.Header to access all headers. Because Header is a map[string][]string, two loops are required to access all headers.

// Loop over header names
for name, values := range r.Header {
    // Loop over all values for the name.
    for _, value := range values {
        fmt.Println(name, value)
    }
}