diff --git a/lib/rmt/mirror.rb b/lib/rmt/mirror.rb
index 747d93f9e..a78f94dc7 100644
--- a/lib/rmt/mirror.rb
+++ b/lib/rmt/mirror.rb
@@ -13,5 +13,18 @@ def initialize(repository:, base_dir:, logger:, mirror_sources: false, is_airgap
   end
 
   def detect_repository_type
+    search = {
+      repomd: File.join(repository.external_url, RPM_FILE_NEEDLE),
+      debian: File.join(repository.external_url, DEB_FILE_NEEDLE)
+    }
+
+    search.each do |key, url|
+      request = RMT::HttpRequest.new(url, method: :head, followlocation: true)
+      request.on_success do
+        return key
+      end
+      request.run
+    end
+    nil
   end
 end
diff --git a/lib/rmt/mirror/repomd.rb b/lib/rmt/mirror/repomd.rb
index 31ed454bd..05b586b84 100644
--- a/lib/rmt/mirror/repomd.rb
+++ b/lib/rmt/mirror/repomd.rb
@@ -10,7 +10,7 @@ class RMT::Mirror::Repomd::Exception < RuntimeError
   include RMT::Deduplicator
   include RMT::FileValidator
 
-  def initialize(mirroring_base_dir: RMT::DEFAULT_MIRROR_DIR, logger:, mirror_src: false, airgap_mode: false)
+  def initialize(logger:, mirroring_base_dir: RMT::DEFAULT_MIRROR_DIR, mirror_src: false, airgap_mode: false)
     @mirroring_base_dir = mirroring_base_dir
     @logger = logger
     @mirror_src = mirror_src
@@ -153,8 +153,8 @@ def mirror_packages(metadata_files, repository_dir, repository_url)
 
     package_file_references = package_references.map do |reference|
       RMT::Mirror::FileReference.build_from_metadata(reference,
-                                        base_dir: repository_dir,
-                                        base_url: repository_url)
+                                                     base_dir: repository_dir,
+                                                     base_url: repository_url)
     end
 
     failed_downloads = download_package_files(package_file_references)
diff --git a/spec/lib/rmt/mirror/repomd_spec.rb b/spec/lib/rmt/mirror/repomd_spec.rb
index 8f676f9fd..d574716f6 100644
--- a/spec/lib/rmt/mirror/repomd_spec.rb
+++ b/spec/lib/rmt/mirror/repomd_spec.rb
@@ -200,7 +200,7 @@
       before do
         expect(logger).to receive(:info).with(/Mirroring repository/).once
         expect(logger).to receive(:info).with('Repository metadata signatures are missing').once
-        expect(logger).to receive(:info).with(/↓/).at_least(1).times
+        expect(logger).to receive(:info).with(/↓/).at_least(:once)
         rmt_mirror.mirror(**mirror_params)
       end
 
@@ -234,7 +234,7 @@
 
       before do
         expect(logger).to receive(:info).with(/Mirroring repository/).once
-        expect(logger).to receive(:info).with(/↓/).at_least(1).times
+        expect(logger).to receive(:info).with(/↓/).at_least(:once)
         rmt_mirror.mirror(**mirror_params)
       end
 
@@ -289,6 +289,7 @@
 
       context "when can't create tmp dir", vcr: { cassette_name: 'mirroring_product' } do
         before { allow(Dir).to receive(:mktmpdir).and_raise('mktmpdir exception') }
+
         it 'handles the exception' do
           expect { rmt_mirror.mirror(**mirror_params) }.to raise_error(RMT::Mirror::Repomd::Exception)
         end
@@ -302,6 +303,7 @@
             .with([file_reference_containing_path('repodata/repomd.xml')])
             .and_raise(RMT::Downloader::Exception, "418 - I'm a teapot")
         end
+
         it 'handles RMT::Downloader::Exception' do
           expect { rmt_mirror.mirror(**mirror_params) }
             .to raise_error(RMT::Mirror::Repomd::Exception, "Error while mirroring metadata: 418 - I'm a teapot")
@@ -343,10 +345,12 @@
       context "when can't download some of the license files" do
         before do
           allow_any_instance_of(RMT::Downloader).to receive(:download_multi).and_wrap_original do |klass, *args|
-            raise RMT::Downloader::Exception.new('') if args[0][0].local_path =~ /license/
+            raise RMT::Downloader::Exception.new('') if /license/.match?(args[0][0].local_path)
+
             klass.call(*args)
           end
         end
+
         it 'handles RMT::Downloader::Exception', vcr: { cassette_name: 'mirroring_product' } do
           expect { rmt_mirror.mirror(**mirror_params) }.to raise_error(RMT::Mirror::Repomd::Exception, /Error while mirroring license files:/)
         end
@@ -354,6 +358,7 @@
 
       context "when can't parse metadata", vcr: { cassette_name: 'mirroring_product' } do
         before { allow_any_instance_of(RepomdParser::RepomdXmlParser).to receive(:parse).and_raise('Parse error') }
+
         it 'removes the temporary metadata directory' do
           expect { rmt_mirror.mirror(**mirror_params) }
             .to raise_error(RMT::Mirror::Repomd::Exception, 'Error while mirroring metadata: Parse error')
@@ -365,6 +370,7 @@
 
       context 'when Interrupt is raised', vcr: { cassette_name: 'mirroring_product' } do
         before { allow_any_instance_of(RepomdParser::RepomdXmlParser).to receive(:parse).and_raise(Interrupt.new) }
+
         it 'removes the temporary metadata directory' do
           expect { rmt_mirror.mirror(**mirror_params) }.to raise_error(Interrupt)
 
@@ -377,21 +383,27 @@
         it 'handles RMT::Downloader::Exception' do
           allow_any_instance_of(RMT::Downloader).to receive(:make_request).and_wrap_original do |klass, *args|
             # raise the exception only for the RPMs/DRPMs
-            raise(RMT::Downloader::Exception, "418 - I'm a teapot") if args[0].local_path =~ /rpm$/
+            raise(RMT::Downloader::Exception, "418 - I'm a teapot") if /rpm$/.match?(args[0].local_path)
+
             klass.call(*args)
           end
 
-          expect { rmt_mirror.mirror(**mirror_params) }.to raise_error(RMT::Mirror::Repomd::Exception, 'Error while mirroring packages: Failed to download 6 files')
+          expect do
+            rmt_mirror.mirror(**mirror_params)
+          end.to raise_error(RMT::Mirror::Repomd::Exception, 'Error while mirroring packages: Failed to download 6 files')
         end
 
         it 'handles RMT::ChecksumVerifier::Exception' do
           allow_any_instance_of(RMT::Downloader).to receive(:make_request).and_wrap_original do |klass, *args|
             # raise the exception only for the RPMs/DRPMs
-            raise(RMT::ChecksumVerifier::Exception, "Checksum doesn't match") if args[0].local_path =~ /rpm$/
+            raise(RMT::ChecksumVerifier::Exception, "Checksum doesn't match") if /rpm$/.match?(args[0].local_path)
+
             klass.call(*args)
           end
 
-          expect { rmt_mirror.mirror(**mirror_params) }.to raise_error(RMT::Mirror::Repomd::Exception, 'Error while mirroring packages: Failed to download 6 files')
+          expect do
+            rmt_mirror.mirror(**mirror_params)
+          end.to raise_error(RMT::Mirror::Repomd::Exception, 'Error while mirroring packages: Failed to download 6 files')
         end
       end
     end
@@ -795,7 +807,7 @@
       it 'mirrors as normal' do
         expect(logger).to receive(:info).with(/Mirroring repository/).once
         expect(logger).to receive(:info).with('Repository metadata signatures are missing').once
-        expect(logger).to receive(:info).with(/↓/).at_least(1).times
+        expect(logger).to receive(:info).with(/↓/).at_least(:once)
 
         allow_any_instance_of(RMT::Downloader).to receive(:finalize_download).and_wrap_original do |klass, *args|
           if args[1].local_path.include?('repodata/repomd.xml.key')
@@ -817,7 +829,7 @@
 
       it 'raises RMT::Mirror::Repomd::Exception' do
         expect(logger).to receive(:info).with(/Mirroring repository/).once
-        expect(logger).to receive(:info).with(/↓/).at_least(1).times
+        expect(logger).to receive(:info).with(/↓/).at_least(:once)
 
         expect_any_instance_of(described_class).to(
           receive(:mirror_metadata).and_call_original
@@ -833,7 +845,7 @@
 
         expect { rmt_mirror.mirror(**mirror_params) }.to raise_error(
           RMT::Mirror::Repomd::Exception,
-           'Error while mirroring metadata: Downloading repo signature/key failed with: HTTP request failed, HTTP code 502'
+          'Error while mirroring metadata: Downloading repo signature/key failed with: HTTP request failed, HTTP code 502'
         )
       end
     end
diff --git a/spec/lib/rmt/mirror_spec.rb b/spec/lib/rmt/mirror_spec.rb
index edf9302d1..e7de0d856 100644
--- a/spec/lib/rmt/mirror_spec.rb
+++ b/spec/lib/rmt/mirror_spec.rb
@@ -14,24 +14,33 @@
   end
 
   describe '#detect_repository_type' do
+    let(:repomd_url) { 'http://some.test.us/path/directory/repodata/repomd.xml' }
+    let(:debian_url) { 'http://some.test.us/path/directory/Release' }
+
     context 'repomd repository' do
       it 'detects a repomd repository' do
+        stub_request(:head, repomd_url).to_return(status: 200, body: '', headers: {})
+
         expect(mirror.detect_repository_type).to eq(:repomd)
       end
     end
 
     context 'debian flat repository' do
       it 'detects a flat debian repository' do
+        stub_request(:head, repomd_url).to_return(status: 404, body: '', headers: {})
+        stub_request(:head, debian_url).to_return(status: 200, body: '', headers: {})
+
         expect(mirror.detect_repository_type).to eq(:debian)
       end
     end
 
-    context 'debian repository' do
-      it 'detects a full blown debian repository and raises'
-    end
-
     context 'unknown repository type' do
-      it 'raises if a unknown repository type is detected'
+      it 'raises if a unknown repository type is detected' do
+        stub_request(:head, repomd_url).to_return(status: 404, body: '', headers: {})
+        stub_request(:head, debian_url).to_return(status: 404, body: '', headers: {})
+
+        expect(mirror.detect_repository_type).to be_nil
+      end
     end
   end
 end