Escape zero bytes in header values.

Fixes typhoeus#180.

lib/typhoeus/easy/options.rb

@@ -107,9 +107,13 @@ def set_option(option, value)
 
       def set_headers
         @header_list = nil
-        headers.each {|key, value| @header_list = Curl.slist_append(@header_list, "#{key}: #{value}") }
+        headers.each {|key, value| @header_list = Curl.slist_append(@header_list, "#{key}: #{escape_zero_byte(value)}") }
         set_option(:httpheader, @header_list) unless headers.empty?
       end
+
+      def escape_zero_byte(value)
+        value.gsub(0.chr, '\\\0')
+      end
     end
   end
 end

spec/typhoeus/easy/options_spec.rb

@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe Typhoeus::EasyFu::Options do
+  describe "#set_headers" do
+    let(:headers) { { 'User-Agent' => "fubar\0" } }
+    let(:request) { Typhoeus::Request.get("http://localhost:3001", { :headers => headers }) }
+
+    it "sends them" do
+      request.body.should include("fubar")
+    end
+
+    it "removes zero bytes from values" do
+      request.body.should include("fubar\\\\0")
+    end
+  end
+end