In Reader.open, ignore content_type if it is 'text/plain'. This allows us to fall back on file_name and/or sampling.

Author: gkellogg

lib/rdf/reader.rb

@@ -207,7 +207,9 @@ def self.open(filename, format: nil, **options, &block)
 
       Util::File.open_file(filename, options) do |file|
         format_options = options.dup
-        format_options[:content_type] ||= file.content_type if file.respond_to?(:content_type)
+        format_options[:content_type] ||= file.content_type if
+          file.respond_to?(:content_type) &&
+          !file.content_type.to_s.include?('text/plain')
         format_options[:file_name] ||= filename
         reader = if self == RDF::Reader
           # We are the abstract reader class, find an appropriate reader

spec/reader_spec.rb

@@ -71,5 +71,20 @@
         reader_mock.got_here
       end
     end
+
+    it "ignores content type 'text/plain'" do
+      uri = "http://example/foo.ttl"
+      accept = (RDF::Format.accept_types + %w(*/*;q=0.1)).join(", ")
+      reader_mock = double("reader")
+      expect(reader_mock).to receive(:got_here)
+      WebMock.
+        stub_request(:get, uri).
+        to_return(body: "foo", status: 200, headers: { 'Content-Type' => 'text/plain'})
+
+      described_class.open(uri) do |r|
+        expect(r).to be_a(RDF::Turtle::Reader)
+        reader_mock.got_here
+      end
+    end
   end
 end