QNetworkAccessManager - how to enable more than 6 connections

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Hello, I'm trying to cooperate with very busy web server. I send get and post requests to it and wait few seconds for response. If there is no response I'm doing what I would do in a web browser - send request again. I think that this is an equivalent to refreshing page. But there is a problem. In HttpAnalyzerStdV7 I can see http requests and responds. It looks like QNetworkAccessManager let me sends only 6 requests at once and only when server responds after about 120 seconds with 504 - http timeout code I can send a new one. How can I abandon old request? I thought that deleting QNetworkReply would be enough but it doesn't work. Any suggestions?