When polling, typically for couple of seconds from refresh, there are X-More-Data and X-Text-Size headers present in all responses to 'progressiveHtml' requests. Responses look like this (only Content-Length, Date, X-ConsoleAnnotator and X-Text-Size headers differs between requests):

Cache-Control:max-age=0, no-cache
Connection:Keep-Alive
Content-Encoding:gzip
Content-Length:151
Content-Type:text/html;charset=UTF-8
Date:Thu, 30 Oct 2014 12:03:39 GMT
Keep-Alive:timeout=5, max=91
Server:Apache
Vary:Accept-Encoding
X-ConsoleAnnotator:7MYs6ttMMoModS4EVo7TUCG79S3ndnWRJpG1rPfajEK/KFxnFhMBC/D3zeM0xiuEYJDHZ4w/GiQAwBpuiCiRbTshPhZm+Jjau4J0XfzamZptCfN++vXbE0qLVLZbcpyl
X-Frame-Options:SAMEORIGIN
X-Mod-Pagespeed:1.7.30.4-
X-More-Data:true
X-Text-Size:2625

The last response, after which the page stops polling, looks like this:

Cache-Control:max-age=0, no-cache
Connection:Keep-Alive
Content-Length:0
Content-Type:text/html;charset=UTF-8
Date:Thu, 30 Oct 2014 12:03:41 GMT
Keep-Alive:timeout=5, max=89
Server:Apache
X-Frame-Options:SAMEORIGIN
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