diff --git a/src/main.rs b/src/main.rs
index cb6b1f0..d568aa2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,6 @@
 extern crate hyper;
 extern crate hyper_native_tls;
+extern crate url;
 
 use std::env;
 use std::io;
@@ -7,18 +8,22 @@ use hyper::Client;
 use hyper::header::{Headers, Authorization, Basic};
 use hyper::net::HttpsConnector;
 use hyper_native_tls::NativeTlsClient;
+use url::{ParseError, Url};
 
-fn collection_uri(hatena_id: &str, blog_id: &str) -> String {
-    format!("https://blog.hatena.ne.jp/{hatena_id}/{blog_id}/atom/entry",
-            hatena_id = hatena_id,
-            blog_id = blog_id)
+fn collection_uri(hatena_id: &str, blog_id: &str) -> Result<Url, ParseError> {
+    let base_url = "https://blog.hatena.ne.jp";
+    let url_string = format!("{base_url}/{hatena_id}/{blog_id}/atom/entry",
+                             base_url = base_url,
+                             hatena_id = hatena_id,
+                             blog_id = blog_id);
+    Url::parse(&url_string)
 }
 
 fn get() {
     let hatena_id = env::var("HATENA_USERNAME").unwrap();
     let blog_id = env::var("HATENA_BLOG_ID").unwrap();
     let api_key = env::var("HATENA_API_KEY").unwrap();
-    let url = collection_uri(&hatena_id, &blog_id);
+    let url = collection_uri(&hatena_id, &blog_id).unwrap();
 
     let ssl = NativeTlsClient::new().unwrap();
     let connector = HttpsConnector::new(ssl);
@@ -29,7 +34,7 @@ fn get() {
         password: Some(api_key.to_owned()),
     };
     headers.set(Authorization(basic));
-    let mut res = client.get(&url).headers(headers).send().unwrap();
+    let mut res = client.get(url).headers(headers).send().unwrap();
     println!("Response: {}", res.status);
     println!("Headers:\n{}", res.headers);
     io::copy(&mut res, &mut io::stdout()).unwrap();