System.XmlException: start tag unexpected character =

This is the full error:

System.XmlException: start tag unexpected character = (position: END_TAG seen ...<source> Bicycling</source><media:contenturl=... @1:688)

So from my understanding, this is not valid XML. I was having an issue with the session body and had to make the following change:

<rss xmlns:media="http:..." and had to add <rsstxlmns:media="https:..."

Now, I am not sure how to go about this with the = sign.

@isTest
    global class getRSSFeedMockCallout implements HttpCalloutMock 
{

  global HttpResponse respond(HttpRequest request)
  {
      String sessionBody = '<rsstxmlns:media="http://search.yahoo.com/mrss/"version="2.0">' +
      '<channel>'+
        '<item>'+
          '<title>Draymond Green Is a SoulCycle Devotee - Bicycling</title>'+
          '<link>https://www.bicycling.com/news/a27024393/draymond-green-soulcycle/</link>'+
          '<pubDate>Wed, 03 Apr 2019 12:00:00 GMT</pubDate>'+
          '<description><a href="https://www.bicycling.com/news/a27024393/draymond-green-soulcycle/"target="_blank">Draymond Green Is a SoulCycle Devotee</a>&nbsp;&nbsp;<font color="#6f6f6f">Bicycling</font><p>If you take SoulCycle classes in the Bay Area, and you notice one extremely tall guy in the room, you may be looking at Golden State Warriors star Draymond ...</p></description>'+
          '<source>Bicycling</source>'+
          '<media:contenturl="https://lh5.googleusercontent.com/proxy/QvLCgDJMIqLENGFBUt1CCoUPO1XB6gJkGFPV5FuM0QKfyaG8WdhuHGtfcVaTzNzPAYyHo-arnqUBkWkZ8s7-p7WBUbKlfJ4xr0hl8hltQWsBCG0yDDh13Ul5qKrZgLvjQitRecmu=-w150-h150-c"medium="image"width="150"height="150"/>'+
        '</item>'+
      '</channel>'+
    '</rss>';


      HttpResponse res = new HttpResponse();
      res.setHeader('Content-Type', 'text/xml');
      res.setBody( sessionBody );
      res.setStatusCode(200);
      return res;
  }   
}

Answers:

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Method 1

There are few things wrong with the xml.

1) In Apex, the string starts and end with single quotes ' , thus you don’t need to escape "

2) You cannot use & in XML, it makes XML invalid, you have to escape it.   will become  

3) There is no tag as media:contenturl in rss specification ,the tag is media:content and having url as an attribute. Seems like you missed a space in that.

Thus fixing all the above problem and formating the code, the code would be something like

String input = '<rss xmlns:media="http://search.yahoo.com/mrss/" version="2.0">' +
        '<channel>' +
        '<item>' +
        '<title>Draymond Green Is a SoulCycle Devotee - Bicycling</title>' +
        '<link>https://www.bicycling.com/news/a27024393/draymond-green-soulcycle/</link>' +
        '<pubDate>Wed, 03 Apr 2019 12:00:00 GMT</pubDate>' +
        '<description>' +
        '<a href="https://www.bicycling.com/news/a27024393/draymond-green-soulcycle/" rel="nofollow noreferrer noopener" target="_blank">Draymond Green Is a SoulCycle Devotee &amp;nbsp;&amp;nbsp; </a>' +
        '<font color="#6f6f6f">Bicycling</font>' +
        '<p>If you take SoulCycle classes in the Bay Area, and you notice one extremely tall guy in the room, you may be looking at Golden State Warriors star Draymond ...</p>' +
        '</description>' +
        '<source>Bicycling</source>' +
        '<media:content url ="https://lh5.googleusercontent.com/proxy/QvLCgDJMIqLENGFBUt1CCoUPO1XB6gJkGFPV5FuM0QKfyaG8WdhuHGtfcVaTzNzPAYyHo-arnqUBkWkZ8s7-p7WBUbKlfJ4xr0hl8hltQWsBCG0yDDh13Ul5qKrZgLvjQitRecmu=-w150-h150-c" medium="image" width="150" height="150"/>' +
        '</item>' +
        '</channel>' +
        '</rss>';


System.debug(input);

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