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+# Overriding KestrelServerOptions
+
+## Default WireMock.Net KestrelServerOptions
+These are [all available Kestrel server options](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.server.kestrel.core.kestrelserveroptions?view=aspnetcore-3.1) and you can read here [all available Kestrel server options limits and their default values](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.server.kestrel.core.kestrelserveroptions.limits?view=aspnetcore-3.1#Microsoft_AspNetCore_Server_Kestrel_Core_KestrelServerOptions_Limits).
+
+WireMock.Net overrides some of those Kestrel server options limits, i.e.
+
+- `KestrelServerOptions.Limits.MaxRequestBodySize`: unlimited.
+- `KestrelServerOptions.Limits.MaxRequestBufferSize`: unlimited.
+
+You can check the variables that WireMock.Net overrides by default [here for .NET Standard 1.3](https://github.com/WireMock-Net/WireMock.Net/blob/master/src/WireMock.Net/Owin/AspNetCoreSelfHost.NETStandard13.cs) and [here for .NET Standard > 1.3](https://github.com/WireMock-Net/WireMock.Net/blob/master/src/WireMock.Net/Owin/AspNetCoreSelfHost.NETStandard.cs).
+
+## Overriding Kestrel server options yourself
+WireMock.Net also allows you to override those Kestrel server options and limits.
+
+`KestrelServerOptions` can generally be overridden using a configuration provider, which expects them to follow the following structure:
+
+```json
+{
+  "Kestrel": {
+    "Limits": {
+      "MaxRequestBodySize": 30000000,
+      "MaxRequestHeadersTotalSize": 32768
+    },
+    "DisableStringReuse": true
+  }
+}
+```
+
+The recommended, multi-platform way of defining nested environment variables is using `__`.
+
+Examples:
+
+- You can override `KestrelServerOptions.Limits.MaxRequestHeadersTotalSize` by setting `Kestrel__Limits__MaxRequestHeadersTotalSize` environment variable to 65536.
+- You can override `KestrelServerLimits.Http2.MaxRequestHeaderFieldSize` by setting `Kestrel__Limits__Http2__MaxRequestHeaderFieldSize` environment variable to 16384.
+
+Please bear in mind that:
+
+- Environment variable values take precedence over WireMock default overrides.
+- You can only override WireMock Kestrel options using environment variables, not configuration files.
+
+You can find more information about Kestrel options and their configuration [here](https://docs.microsoft.com/en-us/aspnet/core/fundamentals/servers/kestrel?view=aspnetcore-3.1#kestrel-options).