diff --git a/lib/fetch-url.js b/lib/fetch-url.js
index d205678..7b3c771 100644
--- a/lib/fetch-url.js
+++ b/lib/fetch-url.js
@@ -5,6 +5,10 @@ const request = require("request");
 
 module.exports = (url, service) => {
     return new Promise((resolve, reject) => {
+        if (typeof url == "string") {
+            url = { url };
+        }
+        url.headers = { "User-Agent": "pr-preview" };
         request(url, function (error, response, body) {
             if (error) {
                 error.data = { request_url: url, service: service };
diff --git a/lib/mixins/fetchable.js b/lib/mixins/fetchable.js
index c981964..f08cd65 100644
--- a/lib/mixins/fetchable.js
+++ b/lib/mixins/fetchable.js
@@ -42,7 +42,7 @@ module.exports = (superclass) => class extends superclass {
     getBikeshedUrl(data) {
         let query = this.getQuery(data, "&", true);
         return {
-            method: "post",
+            method: "POST",
             url: `https://api.csswg.org/bikeshed/?url=${ urlencode(this.github_url) }${ query }`
         }
     }