Tobias Zimmergren • 5/20/2020

ASP.NET Core Blazor with SignalR breaks when used with Cloudflare's HTML minification

This article explains a production issue where ASP.NET Core Blazor with SignalR fails to connect when Cloudflare's HTML minification is enabled. The root cause is that Cloudflare removes HTML comments, which are essential for Blazor's SignalR-based server-side rendering. It details the expected HTML structure, the specific comments required by Blazor, and provides a solution to disable HTML minification for Blazor pages. A useful troubleshooting guide for developers deploying Blazor apps behind Cloudflare.

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#cloudflare #blazor #Aspnet Core