How Can I Increase the Number of Concurrent HTTP Requests in My Windows Application?

Limiting Parallel HTTP Requests: Exploring Windows Registry Configuration

In an effort to optimize an application that performs numerous asynchronous HTTP requests using a ThreadPool, the developer initially encountered performance constraints. Initial troubleshooting sought to address potential limitations on the server-side, but this avenue was eliminated.

Research suggested potential restrictions imposed by Windows on the number of simultaneous requests to the same web server. Enhancing the registry values "MaxConnectionsPerServer" and "MaxConnectionsPer1_0Server" within [HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionInternet Settings] was recommended as a means of altering this behavior. However, the anticipated improvements failed to materialize. Suspicions arose that the referenced registry values might be incorrect or that the modification was no longer effective in the current Windows environment.

Interestingly, altering the MaxThreads setting in ThreadPool did not impact the application's performance, thus excluding it as a potential bottleneck. Corresponding Resource Monitor observations further confirmed limited TCP connections.

Correcting the Approach

Upon closer examination, it became apparent that the issue stemmed from limitations introduced by the ServicePoint class, which manages connections for HTTP operations. Each ServicePoint object dictates a maximum of two concurrent connections by default. To mitigate this constraint, the developer modified the "ServicePointManager.DefaultConnectionLimit" property to accommodate a larger number of simultaneous requests. This adjustment ultimately resolved the issue, allowing the application to run multiple HTTP requests concurrently.

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