Fix content-type parsing bug in transport module and support UTF-8 encoding in SentinelApiClient (#1207)

* Fix content-type parsing bug in `sentinel-transport-simple-http` module
* Change the charset of UrlEncodedFormEntity to UTF-8 in SentinelApiClient of the dashboard to support non-ASCII characters

sentinel-dashboard/src/main/java/com/alibaba/csp/sentinel/dashboard/client/SentinelApiClient.java

@@ -62,6 +62,7 @@ import com.alibaba.csp.sentinel.dashboard.domain.cluster.config.ServerFlowConfig
 import com.alibaba.csp.sentinel.dashboard.domain.cluster.config.ServerTransportConfig;
 import com.alibaba.csp.sentinel.dashboard.util.VersionUtils;
 
+import org.apache.http.Consts;
 import org.apache.http.HttpResponse;
 import org.apache.http.NameValuePair;
 import org.apache.http.client.entity.UrlEncodedFormEntity;
@@ -175,12 +176,7 @@ public class SentinelApiClient {
             for (Entry<String, String> entry : params.entrySet()) {
                 list.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
             }
-            try {
-                httpPost.setEntity(new UrlEncodedFormEntity(list));
-            } catch (UnsupportedEncodingException e) {
-                logger.warn("httpPostContent encode entity error: {}", params, e);
-                return null;
-            }
+            httpPost.setEntity(new UrlEncodedFormEntity(list, Consts.UTF_8));
         }
         return httpPost;
     }

sentinel-transport/sentinel-transport-simple-http/src/main/java/com/alibaba/csp/sentinel/transport/command/http/HttpEventTask.java

@@ -113,6 +113,10 @@ public class HttpEventTask implements Runnable {
                     String headerName = bodyLine.substring(0, index);
                     String header = bodyLine.substring(index + 1).trim();
                     if (StringUtil.equalsIgnoreCase("content-type", headerName)) {
+                        int idx = header.indexOf(";");
+                        if (idx > 0){
+                            header = header.substring(0, idx).trim();
+                        }
                         if (StringUtil.equals("application/x-www-form-urlencoded", header)) {
                             supported = true;
                         } else {