Go HTTP client using pkcs12 certificate

convert.sh

#!/bin/sh

## First convert .p12 cert to certificate and key .pem files:

openssl pkcs12 -in cert.p12 \
    -clcerts -nokeys -out usercert.pem
openssl pkcs12 -in cert.p12 \
    -nocerts -out userkey.pem -nodes

main.go

package main

import (
    "crypto/tls"
    "fmt"
    "io/ioutil"
    "log"
    "net/http"

    "strings"
)

func main() {
    // Create request:
    url := "https://host/path"
    body := "request payload"
    req, err := http.NewRequest("POST", url, strings.NewReader(body))
    if err != nil {
        log.Panic("Error creating new HTTP request. ", err)
    }
    
    // Create client:
    cert, err := tls.LoadX509KeyPair("usercert.pem", "userkey.pem")
    if err != nil {
        log.Panic("Certficate load error. ", err)
    }
    tr := &http.Transport{
        TLSClientConfig: &tls.Config{
            Certificates: []tls.Certificate{cert},
        },
    }
    client := &http.Client{Transport: tr}
    
    // Now execute request:
    resp, err := client.Do(req)
    if err != nil {
        log.Panic("Error making HTTP request using client. ", err)
    }
    respBody, _ := ioutil.ReadAll(resp.Body)
    fmt.Println("## Response Body:\n", string(respBody))
}