Golang写了一个帮助调试的代理程序，PHP实现了一个类用于输出调试信息

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<?php
/**
 * PD
 * ProxyDebug
 *
 * @author    kun* @copyright 2014 kun
 * @license   http://www.php.net/license/3_01.txt  PHP License 3.01
 * @version   1.0
 * @link      https://github.com/yangxikun/tag-parse
 * @since     1.0
 */
/**
* PD
*
* @author    rokety* @license   http://www.php.net/license/3_01.txt  PHP License 3.01
* @version   1.0
* @link
* @since     1.0
*/
class PD
{
    protected static $debugItemCount = 0;
    protected static $debugGroupCount = 0;
    protected static $group = array();
    protected static $start;
    protected static $offset = 0;
    protected static $varNameString = null;

    /**
     * getVarName
     * get the variable name
     *
     * @access protected
     * @static
     *
     * @return string
     */
    protected static function getVarName()
    {
        if (self::$varNameString === null) {
            $trace = debug_backtrace();
            $line = file($trace[3][&#39;file&#39;]);
            self::$varNameString = $line[$trace[3][&#39;line&#39;]-1];
        }

        preg_match(
            &#39;~\$([\w\d_]+)~&#39;,
            self::$varNameString,
            $matches,
            PREG_OFFSET_CAPTURE,
            self::$offset
        );

        if (!isset($matches[1])) {
            throw new Exception(&#39;Error Params, should use $variable as params&#39;, 1);
        }
        self::$offset = $matches[1][1];

        return $matches[1][0];
    }

    /**
     * func
     *
     * @param string $type debug type(info, warn, error)
     * @param mixed  $arg  debug variable
     *
     * @access protected
     * @static
     *
     * @return null
     */
    protected static function func($type, $arg)
    {
        if (self::$start) {
            self::$group[] = array(
                "category"=>$type,
                "type"=>gettype($arg),
                "name"=>self::getVarName(),
                "value"=>$arg
            );
        } else {
            self::$debugItemCount++;
            header(
                &#39;Proxy_debug_item_&#39;.self::$debugItemCount.&#39;: &#39;
                .json_encode(
                    ["category"=>$type,
                    "type"=>gettype($arg),
                    "name"=>self::getVarName(),
                    "value"=>$arg]
                )
            );
            header(&#39;Proxy_debug_item_count: &#39;.self::$debugItemCount);
        }
    }

    public static function __callStatic($name, $args)
    {
        $func = [&#39;info&#39;=>&#39;I&#39;, &#39;warn&#39;=>&#39;W&#39;, &#39;error&#39;=>&#39;E&#39;];
        if (isset($func[$name])) {
            self::$offset = 0;
            self::$varNameString = null;
            foreach ($args as $key => $arg) {
                self::func($func[$name], $arg);
            }
        } else {
            throw new Exception(&#39;Call to undefined method!&#39;, 1);
        }
    }

    /**
     * groupStart
     * start record a group
     *
     * @access public
     * @static
     *
     * @return null
     */
    public static function groupStart()
    {
        self::$start = true;
        self::$debugGroupCount++;
    }

    /**
     * groupEnd
     * stop record a group
     *
     * @access public
     * @static
     *
     * @return null
     */
    public static function groupEnd()
    {
        self::$start = false;
        header(
            &#39;Proxy_debug_group_&#39;
            .self::$debugGroupCount
            .&#39;: &#39;.json_encode(self::$group)
        );
        header(&#39;Proxy_debug_group_count: &#39;.self::$debugGroupCount);
        self::$group = array();
    }
}

2. [文件] main.go ~ 6KB

//Proxy Debug
//This simple program is for helping developers debug through http header.
//For more detail, see README.md

package main

import (
    "bufio"
    "encoding/json"
    "fmt"
    "io/ioutil"
    "log"
    "net/http"
    "os"
    "strconv"
    "strings"
)

//color config
var color map[string]interface{}

//Parse config file
func readConfig() {
    config, err := os.Open("config.ini")
    if err != nil {
        log.Fatalln(err)
    }

    buf := bufio.NewReader(config)
    line, _ := buf.ReadString('\n')

    var jsonData interface{}
    err = json.Unmarshal([]byte(line), &jsonData)
    if err != nil {
        log.Fatalln(err)
    }
    var ok bool
    color, ok = jsonData.(map[string]interface{})
    if ok == false {
        log.Fatalln("Parse config file error, it must be a json string!")
    }
    for _, c := range color {
        if c.(float64) > 37 || c.(float64) < 30 {
            log.Fatalln("Config error!The valid value is 30-37.")
        }
    }
    item := [5]string{"url", "varName", "varType", "varValue", "group"}
    for _, i := range item {
        _, has := color[i]
        if has == false {
            log.Fatalln("Losing configuration:", i)
        }
    }
}

func main() {
    var port int = 8888

    if len(os.Args) == 1 {
        fmt.Println("Listening in default port:8888")
    } else if os.Args[1] == "--help" {
        fmt.Println("usage: proxy [-p port]")
        return
    } else if len(os.Args) != 3 || os.Args[1] != "-p" {
        log.Fatalln("Error arguments!Just support &#39;-p port&#39;.")
    } else {
        port, err := strconv.Atoi(os.Args[2])
        if err != nil && port > 65535 || port < 1024 {
            log.Fatalln("Error port, it should be 1024-65535, default is 8888.")
        }
    }

    readConfig()

    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        r.RequestURI = ""
        resp, err := http.DefaultClient.Do(r)
        if err != nil {
            http.NotFound(w, r)
            return
        }
        defer resp.Body.Close()

        //Get the debugging information form http header
        caterory := map[string]int{"I": 34, "W": 33, "E": 31}
        format := "\t \033[%dm-%s\033[%vm %s\033[%vm%s\033[%vm%s\n"
        debugItem := make(map[string]map[string]interface{})
        debugItemIndex := make([]string, 0, 5)
        var jsonData interface{}

        v, okDebugItem := resp.Header["Proxy_debug_item_count"]
        if okDebugItem {
            count, _ := strconv.Atoi(v[0])
            for i := 1; i <= count; i++ {
                index := "Proxy_debug_item_" + strconv.Itoa(i)
                vv, ok := resp.Header[index]
                if ok {
                    err = json.Unmarshal([]byte(vv[0]), &jsonData)
                    if err != nil {
                        continue
                    }
                    data, ok := jsonData.(map[string]interface{})
                    if ok == false {
                        continue
                    }
                    debugItemIndex = append(debugItemIndex, index)
                    debugItem[index] = data
                }
            }
        }

        debugGroup := make(map[string]interface{})
        debugGroupIndex := make([]string, 0, 5)

        v, okDebugGroup := resp.Header["Proxy_debug_group_count"]
        if okDebugGroup {
            count, _ := strconv.Atoi(v[0])
            for i := 1; i  maxLenName {
                    maxLenName = len(v)
                }
                v = vm["type"].(string)
                if len(v) > maxLenType {
                    maxLenType = len(v)
                }
            }

            for _, i := range debugItemIndex {
                n := debugItem[i]["name"].(string)
                t := debugItem[i]["type"].(string)
                c := debugItem[i]["category"].(string)
                fmt.Printf(
                    format,
                    caterory[c],
                    c,
                    color["varName"],
                    n+strings.Repeat(" ", maxLenName-len(n)+1),
                    color["varType"],
                    t+strings.Repeat(" ", maxLenType-len(t)+1),
                    color["varValue"],
                    strings.Replace(fmt.Sprint(debugItem[i]["value"]), "map", "", 1))
            }
        }

        if okDebugGroup {
            if okDebugItem == false {
                fmt.Printf("\033[%vm%v\n", color["url"], r.URL)
            }
            maxLenName := make([]int, len(debugGroupIndex))
            maxLenType := make([]int, len(debugGroupIndex))
            k := 0
            for _, vm := range debugGroup {
                for _, vv := range vm.([]interface{}) {
                    vk, ok := vv.(map[string]interface{})
                    if ok == false {
                        continue
                    }
                    v := vk["name"].(string)
                    if len(v) > maxLenName[k] {
                        maxLenName[k] = len(v)
                    }
                    v = vk["type"].(string)
                    if len(v) > maxLenType[k] {
                        maxLenType[k] = len(v)
                    }
                }
                k++
            }

            k = 0
            for _, i := range debugGroupIndex {
                fmt.Printf("\t\033[%vm=Group %v=\n", color["group"], k+1)
                for _, v := range debugGroup[i].([]interface{}) {
                    vk, ok := v.(map[string]interface{})
                    if ok == false {
                        continue
                    }
                    n := vk["name"].(string)
                    t := vk["type"].(string)
                    c := vk["category"].(string)
                    fmt.Printf(
                        format,
                        caterory[c],
                        c,
                        color["varName"],
                        n+strings.Repeat(" ", maxLenName[k]-len(n)+1),
                        color["varType"],
                        t+strings.Repeat(" ", maxLenType[k]-len(t)+1),
                        color["varValue"],
                        strings.Replace(fmt.Sprint(vk["value"]), "map", "", 1))
                }
                k++
                fmt.Printf("\t\033[%vm=GROUP=\n", color["group"])
            }
        }
    })
    http.ListenAndServe(":"+strconv.Itoa(port), nil)
}

                           

           

           

3. [图片] screenshot.png