Golang React JS Technology Blog

How do you read headers in an HTTP response in Go?

To read headers in an HTTP response in Go, you can use the http.Response struct's Header field, which contains a map of the response headers. Here's an example:
Read headers in an HTTP response

Example

resp, err := http.Get("https://www.example.com")
if err != nil {
    // handle error
}
defer resp.Body.Close()

contentType := resp.Header.Get("Content-Type")
fmt.Println("Content-Type header value:", contentType)

In this example, an HTTP GET request is made to https://www.example.com, and the response is stored in the resp variable. The Header field of the http.Response struct is then accessed to get the value of the Content-Type header using the Get() method. The Get() method returns an empty string if the header is not present in the response.

You can also iterate over all the headers in the response using a for loop:

Example

for key, values := range resp.Header {
    fmt.Println("Header:", key)
    for _, value := range values {
        fmt.Println("Value:", value)
    }
}

In this example, the range keyword is used to iterate over the keys and values in the Header map. The values are stored as slices, as a header can have multiple values with the same key. The inner for loop is used to iterate over each value in the slice.

Most Helpful This Week
How do you handle HTTP authentication with an HTTP client in Go? How do you handle HTTP client caching in Go? How do you read cookies in an HTTP request with an HTTP client in Go? How do you handle HTTP client server compression in Go? How do you send an HTTP DELETE request in Go? How do you send an HTTP PATCH request in Go?