Merge branch 'main' of https://github.com/WJQSERVER-STUDIO/ghproxy

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "gomod" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"

.github/workflows/build-dev.yml

@@ -14,7 +14,7 @@ jobs:
     env:
       OUTPUT_BINARY: ghproxy
       OUTPUT_ARCHIVE: ghproxy.tar.gz
-      GO_VERSION: 1.23.1
+      GO_VERSION: 1.23.2
 
     steps:
       - uses: actions/checkout@v3

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
     env:
       OUTPUT_BINARY: ghproxy
       OUTPUT_ARCHIVE: ghproxy.tar.gz
-      GO_VERSION: 1.23.1
+      GO_VERSION: 1.23.2
 
     steps:
       - uses: actions/checkout@v3

CHANGELOG.md

@@ -1,5 +1,40 @@
 # 更新日志
 
+v1.1.1
+---
+- CHANGE: 修改部分代码，与golang-temp项目定义的开发规范保持一致
+- CHANGE: 更新Go版本至v1.23.2
+- CHANGE: 跟随Caddy更新,修改Caddyfile配置
+
+24w07b
+---
+- CHANGE: 修改部分代码，与golang-temp项目定义的开发规范保持一致
+- CHANGE: 更新Go版本至v1.23.2
+- CHANGE: 跟随Caddy更新,修改Caddyfile配置
+
+24w07a
+---
+- CHANGE: 修改部分代码，与golang-temp项目定义的开发规范保持一致
+- CHANGE: 更新Go版本至v1.23.2
+
+v1.1.0
+---
+- CHANGE: 优化代码结构,对main函数进行模块化,提升可读性
+- CHANGE: Docker代理功能移至DEV版本内,保证稳定性
+- ADD&CHANGE: 增加Auth(用户鉴权)模块,并改进其的错误处理与日志记录
+- CHANGE: 日志模块引入goroutine协程,提升性能
+- ADD: 将主要实现分离,作为Proxy模块,并优化代码结构
+- ADD: 新增安全政策
+
+24w06b
+---
+- CHANGE: 优化代码结构,对main函数进行模块化,提升可读性
+- CHANGE: Docker代理功能移至DEV版本内,保证稳定性
+- ADD&CHANGE: 增加Auth(用户鉴权)模块,并改进其的错误处理与日志记录
+- CHANGE: 日志模块引入goroutine协程,提升性能 (实验性功能)
+- ADD: 将主要实现分离,作为Proxy模块,并优化代码结构
+- ADD: 新增安全政策
+
 v1.0.0
 ---
 - CHANGE: 项目正式发布, 并迁移至[WJQSERVER-STUDIO/ghproxy](https://github.com/WJQSERVER-STUDIO/ghproxy)

DEV-VERSION

@@ -1 +1 @@
-24w06a
+24w07b

README.md

@@ -5,6 +5,8 @@
 
 使用Go实现的GHProxy,用于加速部分地区Github仓库的拉取,支持速率限制,用户鉴权,支持Docker部署
 
+[DEMO](ghproxy.1888866.xyz)
+
 ## 项目说明
 
 ### 项目特点
@@ -14,6 +16,7 @@
 - 支持Docker部署
 - 支持速率限制
 - 支持用户鉴权
+- 符合[RFC 7234](https://httpwg.org/specs/rfc7234.html)的HTTP Cache
 - 使用Caddy作为Web Server
 - 基于[WJQSERVER-STUDIO/golang-temp](https://github.com/WJQSERVER-STUDIO/golang-temp)模板构建,具有标准化的日志记录与构建流程
 
@@ -63,7 +66,7 @@ docker run -p 7210:80 -v ./ghproxy/log/run:/data/ghproxy/log -v ./ghproxy/log/ca
 port: 8080  # 监听端口
 host: "127.0.0.1"  # 监听地址
 sizelimit: 131072000 # 125MB
-logfilepath: "/data/ghproxy/log/ghproxy-0rtt.log"  # 日志文件路径
+logfilepath: "/data/ghproxy/log/ghproxy.log"  # 日志文件路径
 CorsAllowOrigins: true  # 是否允许跨域请求
 auth: true  # 是否开启鉴权
 authtoken: "test"  # 鉴权token
@@ -84,7 +87,7 @@ example.com {
 }
 ```
 
-## TODO & BETA
+## TODO & DEV
 
 ### TODO
 
@@ -92,6 +95,6 @@ example.com {
 - [x] 改进程序效率
 - [x] 用户鉴权
 
-### BETA
+### DEV
 
 - [x] Docker Pull 代理

SECURITY.MD

@@ -0,0 +1,35 @@
+# 安全政策
+
+## 支持的版本
+
+以下版本的项目目前正在接受安全更新:
+
+| 版本 | 是否支持 |
+| --- | --- |
+| v1.x.x | :white_check_mark: |
+| **w**a/b | :warning: 这是测试版本,用于开发测试,可能存在未知的安全隐患 |
+| v0.x.x | :x: 这些版本不再受支持 |
+
+### 版本说明
+
+- **v1.0.0**: 这是正式发布的版本
+- **xx W xx A/B***: 这是开发测试版本,可能存在未知的安全隐患。不推荐在生产环境中使用。
+- **v0.x.x**: 这些早期版本不再受支持,建议尽快升级到 v1.0.0 或更高版本。
+
+### 用户须知
+
+本项目为开源项目,开发者不对使用本项目造成的任何损失或问题承担责任。用户需自行评估并承担使用本项目的风险。
+
+使用本项目,请遵循 **[WSL (WJQSERVER-STUDIO LICENSE)](https://wjqserver-studio.github.io/LICENSE/LICENSE.html)** 协议。
+
+## 报告漏洞
+
+如果您发现本项目存在安全漏洞,请通过发送ISSUES或尝试联系项目维护者来报告。请在您的报告中包含以下信息:
+
+1. 漏洞的描述,包括重现步骤。
+2. 受到漏洞影响的项目版本。
+3. 任何缓解因素,如利用难度或漏洞影响。
+
+项目维护者将审查您的报告,并尽快解决该漏洞。请注意,根据漏洞的复杂程度,可能需要一些时间来调查和修复问题。
+
+感谢您帮助保护本项目的安全!

VERSION

@@ -1 +1 @@
-1.0.0
+1.1.1

auth/auth.go

@@ -0,0 +1,35 @@
+package auth
+
+import (
+	"ghproxy/config"
+	"ghproxy/logger"
+
+	"github.com/gin-gonic/gin"
+)
+
+var logw = logger.Logw
+
+func AuthHandler(c *gin.Context, cfg *config.Config) bool {
+	// 如果身份验证未启用，直接返回 true
+	if !cfg.Auth {
+		logw("auth PASSED")
+		return true
+	}
+
+	// 获取 auth_token 参数
+	authToken := c.Query("auth_token")
+	logw("auth_token received: %s", authToken)
+
+	// 验证 token
+	if authToken == "" {
+		logw("auth FAILED: no auth_token provided")
+		return false
+	}
+
+	isValid := authToken == cfg.AuthToken
+	if !isValid {
+		logw("auth FAILED: invalid auth_token: %s", authToken)
+	}
+
+	return isValid
+}

caddyfile/dev/Caddyfile

@@ -4,7 +4,7 @@
     https_port 443
     order cache before rewrite
     cache {
-        cache_name W-Cache
+        cache_name GhProxyCache
     }
     log {
         level INFO
@@ -20,7 +20,7 @@
         format transform `{request>headers>X-Forwarded-For>[0]:request>remote_ip} - {user_id} [{ts}] "{request>method} {request>uri} {request>proto}" {status} {size} "{request>headers>Referer>[0]}" "{request>headers>User-Agent>[0]}"` {
             time_format "02/Jan/2006:15:04:05 -0700"
         }
-	    output file /data/caddy/log/{args.0}/access.log {
+	    output file /data/caddy/log/{args[0]}/access.log {
 	        roll_size 5MB
 	        roll_keep 10
 	        roll_keep_for 24h
@@ -48,8 +48,8 @@
 (cache) {
     cache {
          allowed_http_verbs GET
-         stale {args.0}
-         ttl {args.1}
+         stale {args[0]}
+         ttl {args[1]}
     }    
 }
 
@@ -68,7 +68,7 @@
 
 (rate_limit) {
     route /* {
-        rate_limit {remote.ip} {args.0}r/m 10000 429
+        rate_limit {remote.ip} {args[0]}r/m 10000 429
     }    
 }
 
@@ -77,7 +77,7 @@
         to 127.0.0.1:8080
         import header_realip
     }
-    import log go
+    import log ghproxy
     import cache 0s 600s
     import error_page  
     import encode

caddyfile/release/Caddyfile

@@ -4,7 +4,7 @@
     https_port 443
     order cache before rewrite
     cache {
-        cache_name W-Cache
+        cache_name GhProxyCache
     }
     log {
         level INFO
@@ -20,7 +20,7 @@
         format transform `{request>headers>X-Forwarded-For>[0]:request>remote_ip} - {user_id} [{ts}] "{request>method} {request>uri} {request>proto}" {status} {size} "{request>headers>Referer>[0]}" "{request>headers>User-Agent>[0]}"` {
             time_format "02/Jan/2006:15:04:05 -0700"
         }
-	    output file /data/caddy/log/{args.0}/access.log {
+	    output file /data/caddy/log/{args[0]}/access.log {
 	        roll_size 5MB
 	        roll_keep 10
 	        roll_keep_for 24h
@@ -48,8 +48,8 @@
 (cache) {
     cache {
          allowed_http_verbs GET
-         stale {args.0}
-         ttl {args.1}
+         stale {args[0]}
+         ttl {args[1]}
     }    
 }
 
@@ -68,7 +68,7 @@
 
 (rate_limit) {
     route /* {
-        rate_limit {remote.ip} {args.0}r/m 10000 429
+        rate_limit {remote.ip} {args[0]}r/m 10000 429
     }    
 }
 
@@ -77,7 +77,7 @@
         to 127.0.0.1:8080
         import header_realip
     }
-    import log go
+    import log ghproxy
     import cache 0s 600s
     import error_page  
     import encode
@@ -94,23 +94,6 @@
         file_server
         import cache 60s 24h
     }
-    
-    handle_errors {
-        @redirects `{err.status_code} in [301, 302, 307]`
-        reverse_proxy @redirects {
-            header_up Location {http.response.header.Location}
-        }
-    }
-
-    route /v2* {
-        reverse_proxy https://registry-1.docker.io {
-            header_up Host registry-1.docker.io
-            header_up X-Real-IP {remote}
-            header_up X-Forwarded-For {http.request.header.X-Forwarded-For}
-            header_up X-Forwarded-Proto {scheme}
-            header_up Authorization {http.request.header.Authorization}
-        }
-    }
 }
 
 import /data/caddy/config.d/*

config/config.yaml

@@ -1,7 +1,7 @@
 port: 8080
 host: "127.0.0.1"
 sizelimit: 131072000 # 125MB
-logfilepath: "/data/ghproxy/log/ghproxy-0rtt.log"
+logfilepath: "/data/ghproxy/log/ghproxy.log"
 CorsAllowOrigins: true
-auth: true
-authtoken: "test"
+auth: false
+authtoken: "test"

go.mod

@@ -1,6 +1,6 @@
 module ghproxy
 
-go 1.23.1
+go 1.23.2
 
 require (
 	github.com/andybalholm/brotli v1.1.0 // indirect

logger/logger.go

@@ -8,8 +8,12 @@ import (
 	"time"
 )
 
-var logFile *os.File
-var logger *log.Logger
+var (
+	logFile     *os.File
+	logger      *log.Logger
+	logChannel  = make(chan string, 100) // 创建一个缓冲通道
+	quitChannel = make(chan struct{})    // 用于通知退出
+)
 
 // Init 初始化日志记录器，接受日志文件路径作为参数
 func Init(logFilePath string) error {
@@ -19,17 +23,29 @@ func Init(logFilePath string) error {
 		return err
 	}
 	logger = log.New(logFile, "", 0) // 不使用默认前缀
+
+	go logWorker() // 启动 goroutine 处理日志
 	return nil
 }
 
-// Log 直接记录日志的函数，带有时间戳
-func Log(customMessage string) {
-	if logger != nil {
-		timestamp := time.Now().Format("02/Jan/2006:15:04:05 -0700") // 使用自定义时间格式
-		logger.Println(timestamp + " - " + customMessage)
+// logWorker 处理日志记录
+func logWorker() {
+	for {
+		select {
+		case msg := <-logChannel:
+			timestamp := time.Now().Format("02/Jan/2006:15:04:05 -0700")
+			logger.Println(timestamp + " - " + msg) // 写入日志
+		case <-quitChannel:
+			return // 退出 goroutine
+		}
 	}
 }
 
+// Log 直接记录日志的函数
+func Log(customMessage string) {
+	logChannel <- customMessage // 将日志消息发送到通道
+}
+
 // Logw 用于格式化日志记录
 func Logw(format string, args ...interface{}) {
 	message := fmt.Sprintf(format, args...) // 格式化消息
@@ -39,6 +55,9 @@ func Logw(format string, args ...interface{}) {
 // Close 关闭日志文件
 func Close() {
 	if logFile != nil {
-		logFile.Close()
+		quitChannel <- struct{}{} // 通知日志 goroutine 退出
+		if err := logFile.Close(); err != nil {
+			Log("Error closing log file: " + err.Error()) // 记录关闭日志时的错误
+		}
 	}
 }

main.go

@@ -3,23 +3,21 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io"
 	"log"
 	"net/http"
 	"regexp"
-	"strconv"
-	"strings"
 
 	"ghproxy/config"
 	"ghproxy/logger"
+	"ghproxy/proxy"
 
 	"github.com/gin-gonic/gin"
-	"github.com/imroc/req/v3"
 )
 
 var cfg *config.Config
 var logw = logger.Logw
 var router *gin.Engine
+var configfile = "/data/ghproxy/config/config.yaml"
 
 var (
 	exps = []*regexp.Regexp{
@@ -34,7 +32,7 @@ var (
 func loadConfig() {
 	var err error
 	// 初始化配置
-	cfg, err = config.LoadConfig("/data/ghproxy/config/config.yaml")
+	cfg, err = config.LoadConfig(configfile)
 	if err != nil {
 		log.Fatalf("Failed to load config: %v", err)
 	}
@@ -75,7 +73,9 @@ func init() {
 	})
 
 	// 未匹配路由处理
-	router.NoRoute(noRouteHandler(cfg))
+	router.NoRoute(func(c *gin.Context) {
+		proxy.NoRouteHandler(cfg)(c)
+	})
 }
 
 func main() {
@@ -95,173 +95,3 @@ func api(c *gin.Context) {
 		"MaxResponseBodySize": cfg.SizeLimit,
 	})
 }
-
-func authHandler(c *gin.Context) bool {
-	if cfg.Auth {
-		authToken := c.Query("auth_token")
-		return authToken == cfg.AuthToken
-	}
-	return true
-}
-
-func noRouteHandler(config *config.Config) gin.HandlerFunc {
-	return func(c *gin.Context) {
-		rawPath := strings.TrimPrefix(c.Request.URL.RequestURI(), "/")
-		re := regexp.MustCompile(`^(http:|https:)?/?/?(.*)`)
-		matches := re.FindStringSubmatch(rawPath)
-
-		rawPath = "https://" + matches[2]
-
-		matches = checkURL(rawPath)
-		if matches == nil {
-			c.String(http.StatusForbidden, "Invalid input.")
-			return
-		}
-
-		if exps[1].MatchString(rawPath) {
-			rawPath = strings.Replace(rawPath, "/blob/", "/raw/", 1)
-		}
-
-		if !authHandler(c) {
-			c.AbortWithStatusJSON(401, gin.H{"error": "Unauthorized"})
-			logw("Unauthorized request: %s", rawPath)
-			return
-		}
-
-		// 日志记录
-		logw("Request: %s %s", c.Request.Method, rawPath)
-		logw("Matches: %v", matches)
-
-		// 代理请求
-		switch {
-		case exps[0].MatchString(rawPath), exps[1].MatchString(rawPath), exps[3].MatchString(rawPath), exps[4].MatchString(rawPath):
-			logw("%s Matched - USE proxy-chrome", rawPath)
-			proxyRequest(c, rawPath, config, "chrome")
-		case exps[2].MatchString(rawPath):
-			logw("%s Matched - USE proxy-git", rawPath)
-			proxyRequest(c, rawPath, config, "git")
-		default:
-			c.String(http.StatusForbidden, "Invalid input.")
-			return
-		}
-	}
-}
-
-func proxyRequest(c *gin.Context, u string, config *config.Config, mode string) {
-	method := c.Request.Method
-	logw("%s Method: %s", u, method)
-
-	client := req.C()
-
-	switch mode {
-	case "chrome":
-		client.SetUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36").
-			SetTLSFingerprintChrome().
-			ImpersonateChrome()
-	case "git":
-		client.SetUserAgent("git/2.33.1")
-	}
-
-	// 读取请求体
-	body, err := io.ReadAll(c.Request.Body)
-	if err != nil {
-		handleError(c, fmt.Sprintf("Failed to read request body: %v", err))
-		return
-	}
-	defer c.Request.Body.Close()
-
-	// 创建新的请求
-	req := client.R().SetBody(body)
-
-	// 复制请求头
-	for key, values := range c.Request.Header {
-		for _, value := range values {
-			req.SetHeader(key, value)
-		}
-	}
-
-	// 发送请求并处理响应
-	resp, err := sendRequest(req, method, u)
-	if err != nil {
-		handleError(c, fmt.Sprintf("Failed to send request: %v", err))
-		return
-	}
-	defer resp.Body.Close()
-
-	// 检查响应内容长度并处理重定向
-	if err := handleResponseSize(resp, config, c); err != nil {
-		logw("Error handling response size: %v", err)
-		return
-	}
-
-	copyResponseHeaders(resp, c, config)
-	c.Status(resp.StatusCode)
-	if _, err := io.Copy(c.Writer, resp.Body); err != nil {
-		logw("Failed to copy response body: %v", err)
-	}
-}
-
-func sendRequest(req *req.Request, method, url string) (*req.Response, error) {
-	switch method {
-	case "GET":
-		return req.Get(url)
-	case "POST":
-		return req.Post(url)
-	case "PUT":
-		return req.Put(url)
-	case "DELETE":
-		return req.Delete(url)
-	default:
-		return nil, fmt.Errorf("unsupported method: %s", method)
-	}
-}
-
-func handleResponseSize(resp *req.Response, config *config.Config, c *gin.Context) error {
-	contentLength := resp.Header.Get("Content-Length")
-	if contentLength != "" {
-		size, err := strconv.Atoi(contentLength)
-		if err == nil && size > config.SizeLimit {
-			finalURL := resp.Request.URL.String()
-			c.Redirect(http.StatusMovedPermanently, finalURL)
-			logw("Redirecting to %s due to size limit (%d bytes)", finalURL, size)
-			return fmt.Errorf("response size exceeds limit")
-		}
-	}
-	return nil
-}
-
-func copyResponseHeaders(resp *req.Response, c *gin.Context, config *config.Config) {
-	headersToRemove := []string{"Content-Security-Policy", "Referrer-Policy", "Strict-Transport-Security"}
-
-	for _, header := range headersToRemove {
-		resp.Header.Del(header)
-	}
-
-	for key, values := range resp.Header {
-		for _, value := range values {
-			c.Header(key, value)
-		}
-	}
-
-	if config.CORSOrigin {
-		c.Header("Access-Control-Allow-Origin", "*")
-	} else {
-		c.Header("Access-Control-Allow-Origin", "")
-	}
-}
-
-func handleError(c *gin.Context, message string) {
-	c.String(http.StatusInternalServerError, fmt.Sprintf("server error %v", message))
-	logw(message)
-}
-
-func checkURL(u string) []string {
-	for _, exp := range exps {
-		if matches := exp.FindStringSubmatch(u); matches != nil {
-			logw("URL matched: %s, Matches: %v", u, matches[1:])
-			return matches[1:]
-		}
-	}
-	logw("Invalid URL: %s", u)
-	return nil
-}

proxy/proxy.go

@@ -0,0 +1,184 @@
+// proxy/proxy.go 实验性
+package proxy
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"ghproxy/auth"
+	"ghproxy/config"
+	"ghproxy/logger"
+
+	"github.com/gin-gonic/gin"
+	"github.com/imroc/req/v3"
+)
+
+var logw = logger.Logw
+var cfg *config.Config
+
+var exps = []*regexp.Regexp{
+	regexp.MustCompile(`^(?:https?://)?github\.com/([^/]+)/([^/]+)/(?:releases|archive)/.*`),
+	regexp.MustCompile(`^(?:https?://)?github\.com/([^/]+)/([^/]+)/(?:blob|raw)/.*`),
+	regexp.MustCompile(`^(?:https?://)?github\.com/([^/]+)/([^/]+)/(?:info|git-).*`),
+	regexp.MustCompile(`^(?:https?://)?raw\.github(?:usercontent|)\.com/([^/]+)/([^/]+)/.+?/.+`),
+	regexp.MustCompile(`^(?:https?://)?gist\.github\.com/([^/]+)/.+?/.+`),
+}
+
+func NoRouteHandler(cfg *config.Config) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		rawPath := strings.TrimPrefix(c.Request.URL.RequestURI(), "/")
+		re := regexp.MustCompile(`^(http:|https:)?/?/?(.*)`)
+		matches := re.FindStringSubmatch(rawPath)
+
+		rawPath = "https://" + matches[2]
+
+		matches = CheckURL(rawPath)
+		if matches == nil {
+			c.String(http.StatusForbidden, "Invalid input.")
+			return
+		}
+
+		if exps[1].MatchString(rawPath) {
+			rawPath = strings.Replace(rawPath, "/blob/", "/raw/", 1)
+		}
+
+		if !auth.AuthHandler(c, cfg) {
+			c.AbortWithStatusJSON(401, gin.H{"error": "Unauthorized"})
+			logw("Unauthorized request: %s", rawPath)
+			return
+		}
+
+		logw("Request: %s %s", c.Request.Method, rawPath)
+		logw("Matches: %v", matches)
+
+		switch {
+		case exps[0].MatchString(rawPath), exps[1].MatchString(rawPath), exps[3].MatchString(rawPath), exps[4].MatchString(rawPath):
+			logw("%s Matched - USE proxy-chrome", rawPath)
+			ProxyRequest(c, rawPath, cfg, "chrome")
+		case exps[2].MatchString(rawPath):
+			logw("%s Matched - USE proxy-git", rawPath)
+			ProxyRequest(c, rawPath, cfg, "git")
+		default:
+			c.String(http.StatusForbidden, "Invalid input.")
+			return
+		}
+	}
+}
+
+func ProxyRequest(c *gin.Context, u string, cfg *config.Config, mode string) {
+	method := c.Request.Method
+	logw("%s Method: %s", u, method)
+
+	client := req.C()
+
+	switch mode {
+	case "chrome":
+		client.SetUserAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36").
+			SetTLSFingerprintChrome().
+			ImpersonateChrome()
+	case "git":
+		client.SetUserAgent("git/2.33.1")
+	}
+
+	body, err := io.ReadAll(c.Request.Body)
+	if err != nil {
+		HandleError(c, fmt.Sprintf("Failed to read request body: %v", err))
+		return
+	}
+	defer c.Request.Body.Close()
+
+	req := client.R().SetBody(body)
+
+	for key, values := range c.Request.Header {
+		for _, value := range values {
+			req.SetHeader(key, value)
+		}
+	}
+
+	resp, err := SendRequest(req, method, u)
+	if err != nil {
+		HandleError(c, fmt.Sprintf("Failed to send request: %v", err))
+		return
+	}
+	defer resp.Body.Close()
+
+	if err := HandleResponseSize(resp, cfg, c); err != nil {
+		logw("Error handling response size: %v", err)
+		return
+	}
+
+	CopyResponseHeaders(resp, c, cfg)
+	c.Status(resp.StatusCode)
+	if _, err := io.Copy(c.Writer, resp.Body); err != nil {
+		logw("Failed to copy response body: %v", err)
+	}
+}
+
+func SendRequest(req *req.Request, method, url string) (*req.Response, error) {
+	switch method {
+	case "GET":
+		return req.Get(url)
+	case "POST":
+		return req.Post(url)
+	case "PUT":
+		return req.Put(url)
+	case "DELETE":
+		return req.Delete(url)
+	default:
+		return nil, fmt.Errorf("unsupported method: %s", method)
+	}
+}
+
+func HandleResponseSize(resp *req.Response, cfg *config.Config, c *gin.Context) error {
+	contentLength := resp.Header.Get("Content-Length")
+	if contentLength != "" {
+		size, err := strconv.Atoi(contentLength)
+		if err == nil && size > cfg.SizeLimit {
+			finalURL := resp.Request.URL.String()
+			c.Redirect(http.StatusMovedPermanently, finalURL)
+			logw("Redirecting to %s due to size limit (%d bytes)", finalURL, size)
+			return fmt.Errorf("response size exceeds limit")
+		}
+	}
+	return nil
+}
+
+func CopyResponseHeaders(resp *req.Response, c *gin.Context, cfg *config.Config) {
+	headersToRemove := []string{"Content-Security-Policy", "Referrer-Policy", "Strict-Transport-Security"}
+
+	for _, header := range headersToRemove {
+		resp.Header.Del(header)
+	}
+
+	for key, values := range resp.Header {
+		for _, value := range values {
+			c.Header(key, value)
+		}
+	}
+
+	if cfg.CORSOrigin {
+		c.Header("Access-Control-Allow-Origin", "*")
+	} else {
+		c.Header("Access-Control-Allow-Origin", "")
+	}
+}
+
+func HandleError(c *gin.Context, message string) {
+	c.String(http.StatusInternalServerError, fmt.Sprintf("server error %v", message))
+	logw(message)
+}
+
+func CheckURL(u string) []string {
+	for _, exp := range exps {
+		if matches := exp.FindStringSubmatch(u); matches != nil {
+			logw("URL matched: %s, Matches: %v", u, matches[1:])
+			return matches[1:]
+		}
+	}
+	logw("Invalid URL: %s", u)
+	return nil
+}