WinInet limits the number of simultaneous connections that it makes to a single HTTP server. If you exceed this limit, the requests block until one of the current connections has completed. This is by design and is in agreement with the HTTP specification and industry standards.
WinInet limits connections to a single HTTP 1.0 server to four simultaneous connections. Connections to a single HTTP 1.1 server are limited to two simultaneous connections. The HTTP 1.1 specification (RFC2616) mandates the two-connection limit. The four-connection limit for HTTP 1.0 is a self-imposed restriction that coincides with the standard that is used by a number of popular Web browsers.
The only evidence of this limitation to your application is that calls such as HttpSendRequest
appear to take longer to complete because they wait for previous connections to be freed up before their requests are sent.
You can configure WinInet to exceed this limit by creating and setting the following registry entries:Note
By changing these settings, you cause WinInet to go against the HTTP protocol specification recommendation. You should only do this if absolutely necessary and then you should avoid doing standard Web browsing while these settings are in effect:
Sets the number of simultaneous requests to a single HTTP 1.1 Server
Sets the number of simultaneous requests to a single HTTP 1.0 Server
These settings are made for a particular user and will have no affect onother users who log on to the computer.
In Internet Explorer 5, it is possible to change the connection limit programmatically by calling the InternetSetOption
function on NULL handle with the following flags (note that it will change connection limit for the whole process):
If the process has established a connection to a server, if you change the connection limit by calling InternetSetOption
, the function does not have any effect to subsequent connections on the same server. This occurs even if a previous connection is disconnected prior to the call to InternetSetOption
. Connection limit does affect all other servers.