diff --git a/is-html-fast/src/main.rs b/is-html-fast/src/main.rs
index 1d014d3..78822d9 100644
--- a/is-html-fast/src/main.rs
+++ b/is-html-fast/src/main.rs
@@ -6,7 +6,7 @@ use std::sync::atomic::{AtomicUsize, Ordering};
 
 use rayon::prelude::*;
 use reqwest::blocking::Client;
-use reqwest::header::{CONTENT_TYPE, USER_AGENT};
+use reqwest::header::{HeaderMap, HeaderValue, CONTENT_TYPE, USER_AGENT, ACCEPT, ACCEPT_LANGUAGE, ACCEPT_ENCODING, CONNECTION, UPGRADE_INSECURE_REQUESTS};
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let input_file = File::open("domains.txt")?;
@@ -27,10 +27,19 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     let output = Arc::new(Mutex::new(output_file));
 
+    // 브라우저 헤더 세팅
+    let mut headers = HeaderMap::new();
+    headers.insert(USER_AGENT, HeaderValue::from_static("Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0"));
+    headers.insert(ACCEPT, HeaderValue::from_static("text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"));
+    headers.insert(ACCEPT_LANGUAGE, HeaderValue::from_static("ko,en-US;q=0.7,en;q=0.3"));
+    headers.insert(ACCEPT_ENCODING, HeaderValue::from_static("gzip, deflate, br"));
+    headers.insert(CONNECTION, HeaderValue::from_static("keep-alive"));
+    headers.insert(UPGRADE_INSECURE_REQUESTS, HeaderValue::from_static("1"));
+
     let client = Arc::new(
         Client::builder()
             .timeout(Duration::from_secs(5))
-            .user_agent("Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0")
+            .default_headers(headers)
             .build()?,
     );