From: Robert McKinnon <rob_m_mckinnon@...>
Date: 2004-03-11T15:27:35+09:00
Subject: RSS and Rublog, XML parsing error

Another Rublog/Apache problem, extra characters are leaking into my
HTTP Response content which is preventing RSS XML from being parsed on
the web browser.

Parsing error:
   XML Parsing Error: xml processing instruction not at start of
external entity
   Location: http://.../index.rss
   Line Number 3, Column 1:<?xml version="1.0" encoding="iso-8859-1" ?>

HTTP response:
  HTTP/1.1 200 OK
  ...
  Content-Type: text/xml

  fb9
  <!DOCTYPE rss PUBLIC "-//Netscape Communications//DTD RSS 0.91//EN"
                    
"http://my.netscape.com/publish/formats/rss-0.91.dtd"> 
  <?xml version="1.0" encoding="iso-8859-1" ?>
  <rss version="0.91">

What is that extra fb9? The response content is being created by the
Template class in rublog/Template.rb; methods:

  def write_html_on(op, value_hash)
    esc = proc { |str| CGI.escapeHTML(str) }
    op << write_common(value_hash, esc)
  end

  def write_plain_on(op, value_hash)
    esc = proc {|str| str}
    op << write_common(value_hash, esc)
  end

Cheers,
Rob

PS: I added the following line in the RssView.render() method to get
RSS content type to be text/xml:
      @response.add_header("Content-type", "text/xml")


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