bblimke/webmock · error · ArgumentError

Unable to open specified file.

Error message

Unable to open specified file.

What it means

Error "Unable to open specified file." thrown in bblimke/webmock.

Source

Thrown at lib/webmock/http_lib_adapters/patron_adapter.rb:65

        def self.enable!
          Patron.send(:remove_const, :Session)
          Patron.send(:const_set, :Session, WebMockPatronSession)
        end

        def self.disable!
          Patron.send(:remove_const, :Session)
          Patron.send(:const_set, :Session, OriginalPatronSession)
        end

        def self.handle_file_name(req, webmock_response)
          if req.action == :get && req.file_name
            begin
              File.open(req.file_name, "w") do |f|
                f.write webmock_response.body
              end
            rescue Errno::EACCES
              raise ArgumentError.new("Unable to open specified file.")
            end
          end
        end

        def self.build_request_signature(req)
          uri = WebMock::Util::URI.heuristic_parse(req.url)
          uri.path = uri.normalized_path.gsub("[^:]//","/")

          if [:put, :post, :patch].include?(req.action)
            if req.file_name
              if !File.exist?(req.file_name) || !File.readable?(req.file_name)
                raise ArgumentError.new("Unable to open specified file.")
              end
              request_body = File.read(req.file_name)
            elsif req.upload_data
              request_body = req.upload_data
            else
              raise ArgumentError.new("Must provide either data or a filename when doing a PUT or POST")

View on GitHub (pinned to b187df8827)

When it happens

Trigger: Thrown at lib/webmock/http_lib_adapters/patron_adapter.rb:65 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of bblimke/webmock@b187df8827 (2026-08-23). Data as JSON: /api/errors/51b4a8a19712a8bb. Report an issue: GitHub.