diff --git a/lib/jira/resource/attachment.rb b/lib/jira/resource/attachment.rb
index 2e0bb523..a65001ed 100644
--- a/lib/jira/resource/attachment.rb
+++ b/lib/jira/resource/attachment.rb
@@ -42,9 +42,9 @@ def self.meta(client)
       # @param [Hash] headers Any additional headers to call Jira.
       # @yield |file|
       # @yieldparam [IO] file The IO object streaming the download.
-      def download_file(headers = {}, &)
+      def download_file(headers = {}, &block)
         default_headers = client.options[:default_headers]
-        URI.open(content, default_headers.merge(headers), &)
+        URI.parse(content).open(default_headers.merge(headers), &block)
       end
 
       # Downloads the file contents as a string object.
@@ -56,9 +56,7 @@ def download_file(headers = {}, &)
       # @param [Hash] headers Any additional headers to call Jira.
       # @return [String,NilClass] The file contents.
       def download_contents(headers = {})
-        download_file(headers) do |file|
-          file.read
-        end
+        download_file(headers, &:read)
       end
 
       def save!(attrs, path = url)
diff --git a/spec/jira/resource/attachment_spec.rb b/spec/jira/resource/attachment_spec.rb
index d6e35b82..0dde1697 100644
--- a/spec/jira/resource/attachment_spec.rb
+++ b/spec/jira/resource/attachment_spec.rb
@@ -2,7 +2,7 @@
 
 describe JIRA::Resource::Attachment do
   subject(:attachment) do
-    described_class.new(
+    JIRA::Resource::Attachment.new(
       client,
       issue: JIRA::Resource::Issue.new(client),
       attrs: { 'author' => { 'foo' => 'bar' } }
@@ -35,7 +35,7 @@
   end
 
   describe '.meta' do
-    subject { described_class.meta(client) }
+    subject { JIRA::Resource::Attachment.meta(client) }
 
     let(:response) do
       double(
@@ -60,38 +60,37 @@
   end
 
   context 'there is an attachment on an issue' do
+    let(:client) do
+      JIRA::Client.new(username: 'username', password: 'password', auth_type: :basic, use_ssl: false)
+    end
+    let(:attachment_file_contents) { 'file contents' }
+    let(:attachment_url) { 'https://localhost:2990/secure/attachment/32323/myfile.txt' }
     subject(:attachment) do
-      described_class.new(
+      JIRA::Resource::Attachment.new(
         client,
         issue: JIRA::Resource::Issue.new(client),
         attrs: { 'author' => { 'foo' => 'bar' }, 'content' => attachment_url }
       )
     end
 
-    let(:client) do
-      JIRA::Client.new(username: 'username', password: 'password', auth_type: :basic, use_ssl: false)
+    before(:each) do
+      stub_request(:get, attachment_url).to_return(body: attachment_file_contents)
     end
-    let(:attachment_file_contents) { 'file contents' }
-    let(:file_target) { double(read: :attachment_file_contents) }
-    let(:attachment_url) { 'https:jirahost/secure/attachment/32323/myfile.txt' }
 
     describe '.download_file' do
       it 'passes file object to block' do
-        expect(URI).to receive(:open).with(attachment_url, anything).and_yield(file_target)
+        expect(URI).to receive(:parse).with(attachment_url).and_call_original
 
         attachment.download_file do |file|
-          expect(file).to eq(file_target)
+          expect(file.read).to eq(attachment_file_contents)
         end
       end
     end
 
     describe '.download_contents' do
       it 'downloads the file contents as a string' do
-        expect(URI).to receive(:open).with(attachment_url, anything).and_return(attachment_file_contents)
-
-        result_str = attachment.download_contents
-
-        expect(result_str).to eq(attachment_file_contents)
+        expect(URI).to receive(:parse).with(attachment_url).and_call_original
+        expect(attachment.download_contents).to eq(attachment_file_contents)
       end
     end
   end
@@ -105,12 +104,12 @@
       double(
         body: [
           {
-            id: 10_001,
-            self: 'http://www.example.com/jira/rest/api/2.0/attachments/10000',
-            filename: file_name,
-            created: '2017-07-19T12:23:06.572+0000',
-            size: file_size,
-            mimeType: file_mime_type
+            "id": 10_001,
+            "self": 'http://www.example.com/jira/rest/api/2.0/attachments/10000',
+            "filename": file_name,
+            "created": '2017-07-19T12:23:06.572+0000',
+            "size": file_size,
+            "mimeType": file_mime_type
           }
         ].to_json
       )
@@ -131,30 +130,34 @@
         expect(attachment.mimeType).to eq file_mime_type
         expect(attachment.size).to eq file_size
       end
-
       context 'when using custom client headers' do
         subject(:bearer_attachment) do
-          described_class.new(
+          JIRA::Resource::Attachment.new(
             bearer_client,
             issue: JIRA::Resource::Issue.new(bearer_client),
             attrs: { 'author' => { 'foo' => 'bar' } }
           )
         end
-
-        let(:default_headers_given) do
-          { 'authorization' => 'Bearer 83CF8B609DE60036A8277BD0E96135751BBC07EB234256D4B65B893360651BF2' }
-        end
+        let(:default_headers_given) {
+          {
+            'authorization' => 'Bearer 83CF8B609DE60036A8277BD0E96135751BBC07EB234256D4B65B893360651BF2'
+          }
+        }
         let(:bearer_client) do
           JIRA::Client.new(username: 'username', password: 'password', auth_type: :basic, use_ssl: false,
-                           default_headers: default_headers_given)
+                           default_headers: default_headers_given )
         end
         let(:merged_headers) do
-          { 'Accept' => 'application/json', 'X-Atlassian-Token' => 'nocheck' }.merge(default_headers_given)
+          {
+            'Accept' => 'application/json',
+            'X-Atlassian-Token' => 'nocheck'
+          }.merge(default_headers_given)
         end
 
         it 'passes the custom headers' do
-          expect(bearer_client.request_client).to receive(:request_multipart).with(anything, anything,
-                                                                                   merged_headers).and_return(response)
+          expect(bearer_client.request_client).to receive(:request_multipart)
+            .with(anything, anything, merged_headers)
+            .and_return(response)
 
           bearer_attachment.save('file' => path_to_file)
         end
@@ -190,31 +193,32 @@
 
       context 'when using custom client headers' do
         subject(:bearer_attachment) do
-          described_class.new(
+          JIRA::Resource::Attachment.new(
             bearer_client,
             issue: JIRA::Resource::Issue.new(bearer_client),
             attrs: { 'author' => { 'foo' => 'bar' } }
           )
         end
-
-        let(:default_headers_given) do
-          { 'authorization' => 'Bearer 83CF8B609DE60036A8277BD0E96135751BBC07EB234256D4B65B893360651BF2' }
-        end
+        let(:default_headers_given) { { 'authorization' => 'Bearer 83CF8B609DE60036A8277BD0E96135751BBC07EB234256D4B65B893360651BF2' } }
         let(:bearer_client) do
           JIRA::Client.new(username: 'username', password: 'password', auth_type: :basic, use_ssl: false,
-                           default_headers: default_headers_given)
+                           default_headers: default_headers_given )
         end
         let(:merged_headers) do
-          { 'Accept' => 'application/json', 'X-Atlassian-Token' => 'nocheck' }.merge(default_headers_given)
+          {
+            'Accept' => 'application/json',
+            'X-Atlassian-Token' => 'nocheck'
+          }.merge(default_headers_given)
         end
 
         it 'passes the custom headers' do
-          expect(bearer_client.request_client).to receive(:request_multipart).with(anything, anything,
-                                                                                   merged_headers).and_return(response)
+          expect(bearer_client.request_client).to receive(:request_multipart)
+            .with(anything, anything, merged_headers)
+            .and_return(response)
 
           bearer_attachment.save!('file' => path_to_file)
         end
       end
     end
   end
-end
+end
\ No newline at end of file