diff --git a/lib/lgtm/plugin.rb b/lib/lgtm/plugin.rb
index 875b60d..a5f3bc4 100644
--- a/lib/lgtm/plugin.rb
+++ b/lib/lgtm/plugin.rb
@@ -39,11 +39,9 @@ def check_lgtm(image_url: nil, https_image_only: false)
 
     private
 
+    # returns "<h1 align="center">LGTM</h1>" when ServiceTemporarilyUnavailable.
     def fetch_image_url(https_image_only: false)
-      lgtm_post_req = process_request(RANDOM_LGTM_POST_URL)
-      return if lgtm_post_req.code == '503' # returns "<h1 align="center">LGTM</h1>" when Service Temporarily Unavailable; Over Quota.
-      lgtm_post_url = lgtm_post_req['location']
-
+      return unless lgtm_post_url
       lgtm_post_response = process_request(lgtm_post_url) do |req|
         req['Accept'] = 'application/json'
       end
@@ -69,6 +67,12 @@ def process_request(url)
       end
     end
 
+    def lgtm_post_url
+      lgtm_post_req = process_request(RANDOM_LGTM_POST_URL)
+      return if lgtm_post_req.code == '503'
+      lgtm_post_req['location']
+    end
+
     def markdown_template(image_url)
       if image_url.nil?
         "<h1 align='center'>LGTM</h1>"
diff --git a/spec/lgtm_spec.rb b/spec/lgtm_spec.rb
index 678625b..889beb2 100644
--- a/spec/lgtm_spec.rb
+++ b/spec/lgtm_spec.rb
@@ -24,16 +24,19 @@ module Danger
         @lgtm.check_lgtm
         expect(@dangerfile.status_report[:markdowns].length).to eq(1)
       end
+
       it 'lgtm with default url is OverQuota' do
         allow(Net::HTTP).to receive(:start).and_return(mock(code: '503'))
+
         @lgtm.check_lgtm
+
         expect(@dangerfile.status_report[:markdowns][0].message)
           .to eq("<h1 align='center'>LGTM</h1>")
       end
 
       def mock(request_url: 'https://lgtm.in/p/sSuI4hm0q',
                actual_image_url: 'https://example.com/image.jpg',
-               code: '200')
+               code: '302')
         double(
           :[] => request_url,
           body: JSON.generate(