反向代理增加是否重试50X选项，默认为启用

web/public/js/components/server/reverse-proxy-box.js

@@ -25,7 +25,8 @@ Vue.component("reverse-proxy-box", {
 				idleTimeout: {count: 0, unit: "second"},
 				maxConns: 0,
 				maxIdleConns: 0,
-				followRedirects: false
+				followRedirects: false,
+				retry50X: true
 			}
 		}
 		if (reverseProxyConfig.addHeaders == null) {
@@ -165,6 +166,7 @@ Vue.component("reverse-proxy-box", {
 						<input type="checkbox" v-model="reverseProxyRef.isOn"/>
 						<label></label>
 					</div>
+					<p class="comment">选中后，所有源站设置才会生效。</p>
 				</td>
 			</tr>
 			<tr v-show="family == null || family == 'http'">
@@ -176,7 +178,7 @@ Vue.component("reverse-proxy-box", {
 					<div v-show="reverseProxyConfig.requestHostType == 2" style="margin-top: 0.8em">
 						<input type="text" placeholder="比如example.com" v-model="reverseProxyConfig.requestHost"/>
 					</div>
-					<p class="comment">请求源站时的Host，用于修改源站接收到的域名
+					<p class="comment">请求源站时的主机名（Host），用于修改源站接收到的域名
 					<span v-if="reverseProxyConfig.requestHostType == 0">，"跟随CDN域名"是指源站接收到的域名和当前CDN访问域名保持一致</span>
 					<span v-if="reverseProxyConfig.requestHostType == 1">，"跟随源站"是指源站接收到的域名仍然是填写的源站地址中的信息，不随代理服务域名改变而改变</span>					
 					<span v-if="reverseProxyConfig.requestHostType == 2">，自定义Host内容中支持请求变量</span>。</p>
@@ -199,7 +201,7 @@ Vue.component("reverse-proxy-box", {
 				</td>
 			</tr>
 		    <tr v-show="family == null || family == 'http'">
-		        <td>自动添加的Header</td>
+		        <td>自动添加报头</td>
 		        <td>
 		            <div>
 		                <div style="width: 14em; float: left; margin-bottom: 1em" v-for="header in forwardHeaders" :key="header.name">
@@ -207,7 +209,7 @@ Vue.component("reverse-proxy-box", {
                         </div>
                         <div style="clear: both"></div>
                     </div>
-                    <p class="comment">选中后，会自动向源站请求添加这些Header。</p>
+                    <p class="comment">选中后，会自动向源站请求添加这些报头，以便于源站获取客户端信息。</p>
                 </td> 
             </tr>
 			<tr v-show="family == null || family == 'http'">
@@ -298,6 +300,13 @@ Vue.component("reverse-proxy-box", {
                     <p class="comment">源站保持等待的空闲超时时间，0表示使用默认时间。</p>
                 </td>
             </tr>
+            <tr v-show="family == null || family == 'http'">
+            	<td>自动重试50X</td>
+            	<td>
+            		<checkbox v-model="reverseProxyConfig.retry50X"></checkbox>
+            		<p class="comment">选中后，表示当源站返回状态码为50X（比如502、504）时，自动重试。</p>
+				</td>
+			</tr>
             <tr v-show="family != 'unix'">
             	<td>PROXY Protocol</td>
             	<td>