完善文档

Author: ouqiang

README.md

@@ -106,12 +106,26 @@ Flags:
 经过`mars`的流量可在web页查看
 
 ### Nginx
-请求包含特定header, 则转发给`mars`
-```ini
- proxy_set_header X-Mars-Debug 0;
- proxy_set_header Host $http_host;
+请求包含特定header, 则转发给`mars`, 由`mars`访问实际的后端
+
+原配置
+```nginx
+proxy_pass http://172.16.10.103:8080;
+```
+
+使用`mars`后的配置
+```nginx
+ set $targetHost $host;
+
+ if ($http_x_mars_debug = "1") {
+   set $targetHost "172.16.10.103:8080";
+ }
+
+ proxy_set_header X-Mars-Host $host;
+ proxy_set_header Host $targetHost;
  if ($http_x_mars_debug = "1") {
    proxy_pass http://localhost:8888;
+   break;
  }
 ```
 

internal/common/recorder/recorder.go

@@ -88,6 +88,7 @@ func (r *Recorder) BeforeRequest(ctx *goproxy.Context) {
 	if host := ctx.Req.Header.Get("X-Mars-Host"); host != "" {
 		ctx.Req.Host = host
 	}
+	ctx.Req.Header.Del("X-Mars-Host")
 	ctx.Req.Header.Del("X-Mars-Debug")
 	if r.interceptor != nil {
 		r.interceptor.BeforeRequest(ctx)