The two-connection limit is a guideline in the HTTP standard (http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html#sec8.1.4 http://www.w3.org/Protocols/rfc2616

The two-connection limit is a guideline in the HTTP standard (http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html#sec8.1.4 http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html#sec8.1...): >Clients that use persistent connections SHOULD limit the number of simultaneous connections that they maintain to a given server. A single-user client SHOULD NOT maintain more than 2 connections with any server or proxy.