diff --git a/src/main/java/cokr/xit/fims/MainApplication.java b/src/main/java/cokr/xit/fims/MainApplication.java
index 7d6c4376..56ec2d05 100644
--- a/src/main/java/cokr/xit/fims/MainApplication.java
+++ b/src/main/java/cokr/xit/fims/MainApplication.java
@@ -3,6 +3,8 @@ package cokr.xit.fims;
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.List;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
@@ -18,6 +20,8 @@ public class MainApplication extends SpringBootApplicationBridge {
 
 	public static void main(String[] args) {
 
+		allowRestrictedHeaders();
+
 		try {
 			BufferedReader in = new BufferedReader(new InputStreamReader(new ClassPathResource("sgg.txt").getInputStream()));
 			String sgg = in.readLine();
@@ -29,4 +33,24 @@ public class MainApplication extends SpringBootApplicationBridge {
 
 		SpringApplication.run(MainApplication.class, args);
 	}
+
+	public static void allowRestrictedHeaders() {
+		String allowRestrictedHeaders = System.getProperty("jdk.httpclient.allowRestrictedHeaders");
+		if(allowRestrictedHeaders == null) {
+			allowRestrictedHeaders = "";
+		}
+		List<String> allowRestrictedHeadersArr = Arrays.asList(allowRestrictedHeaders.split(","));
+
+		String[] items = {"connection","host","content-length","expect","upgrade"};
+
+		for(String item : items) {
+			if(!allowRestrictedHeadersArr.contains(item)) {
+				if(!allowRestrictedHeaders.equals("")) {
+					allowRestrictedHeaders += ",";
+				}
+				allowRestrictedHeaders += item;
+			}
+		}
+		System.setProperty("jdk.httpclient.allowRestrictedHeaders", allowRestrictedHeaders);
+	}
 }