empty response in F12 network capture

Hi 

I am doing some performance analysis using IE F12 tools. This is IE 11.0. 

I am opening a bunch of URLs and doing network traffic capturing. If I look at the resulting XML, I see an empty response without any HTTP response code. Can anyone tell me what is this about? Is this a bug with F12?

<entry>

<pageref>4</pageref>

<startedDateTime>2015-09-10T20:48:34.384-10:00</startedDateTime>

<time>21653</time>

<request>

<method>GET</method>

<url>http://s.mydom.com/images/png/products/accessories/112.png</url>

<httpVersion>HTTP/1.1</httpVersion>

<cookies/>

<headers>

<header>

<name>Accept</name>

<value>image/png, image/svg+xml, image/*;q=0.8, */*;q=0.5</value>

</header>

<header>

<name>Referer</name>

<value>http://www.myweb.com/accessories.html</value>

</header>

<header>

<name>Accept-Language</name>

<value>en-US</value>

</header>

<header>

<name>User-Agent</name>

<value>Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko</value>

</header>

<header>

<name>Accept-Encoding</name>

<value>gzip, deflate</value>

</header>

<header>

<name>Host</name>

<value>s.mydom.com</value>

</header>

<header>

<name>Connection</name>

<value>Keep-Alive</value>

</header>

</headers>

<queryString/>

<headersSize>374</headersSize>

<bodySize>0</bodySize>

</request>

<response>

<cookies/>

<headers/>

<content>

<size>6841</size>

<mimeType/>

</content>

<redirectionURL/>

<headersSize>0</headersSize>

<bodySize>6841</bodySize>

</response>

<cache/>

<timings>

<send>3261</send>

<wait>17909</wait>

<receive>483</receive>

</timings>

</entry>