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<font face="Arial, Verdana">http://stackoverflow.com/questions/13578428/duplicate-headers-received-from-server</span></font><br/></div><div><font face="Arial, Verdana">
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<font face="Arial, Verdana">I found that the filename could be bad causing this. Are there any commas or semicolon in your filename? What is the filename where this happens. Just tried with my files and it worked so that would be a reasonI could think of.</font>
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<font face="Arial, Verdana">Firefox works stable without connection lost so far for me. Is the pi connected with cable or wifi? With wifi I get this sometimes regardless of browser type as it is not so stable as I'd like it to be. That is not the biggest issue as it reconnects automatically and does not affect the print, but not nice to have.</font>