Update Nu1302 documentation with more information (#3363)

Author: Nigusu-Allehu

docs/reference/errors-and-warnings/NU1302.md

@@ -8,14 +8,47 @@ f1_keywords:
   - "NU1302"
 ---
 
-# NuGet Warning NU1302
+# NuGet Error NU1302
 
 > You are running the 'restore' operation with an 'HTTP' source: myHttpSource. NuGet requires HTTPS sources. To use an HTTP source, you must explicitly set 'allowInsecureConnections' to true in your NuGet.Config file. Please refer to https://aka.ms/nuget-https-everywhere for more information.
 
 ### Issue
 
-`myHttpSource` is an insecure HTTP source. We recommend using HTTPS sources instead.
+`myHttpSource` is an insecure HTTP source. We recommend using an HTTPS source instead.
 
 ### Solution
 
-This can be fixed either by removing the HTTP source or disabling HTTP Errors for the specific source by using `allowInsecureConnections` option in your [NuGet config file](../../reference/nuget-config-file.md).
+#### Option 1: Update the Source to Use HTTPS
+
+If possible, update the package source to use `https://` instead of `http://`:
+
+```xml
+<configuration>
+  <packageSources>
+    <add key="SecureSource" value="https://example.com/nuget/" />
+  </packageSources>
+</configuration>
+```
+
+#### Option 2: Allow Insecure Connections (If Necessary)
+
+If the source must remain HTTP, explicitly allow insecure connections by adding the `AllowInsecureConnections` flag in the `NuGet.Config`:
+
+```xml
+<configuration>
+  <packageSources>
+    <add key="InsecureSource" value="http://example.com/nuget/" allowInsecureConnections="true" />
+  </packageSources>
+</configuration>
+```
+
+#### Option 3: Consult SDK Analysis Level
+
+The [`SdkAnalysisLevel`](/dotnet/core/project-sdk/msbuild-props#sdkanalysislevel) property in your project can serve as a temporary workaround for managing HTTP sources.
+If additional time is needed to resolve the HTTP error, you can lower the `SdkAnalysisLevel` to suppress errors temporarily. 
+Here's how it functions:
+
+- For SDK Analysis Level value **below 9.0.100**, using HTTP sources triggers a warning ([NU1803](NU1803.md)).
+- Starting with SDK Analysis Level **9.0.100 or higher**, HTTP sources result in an error (NU1302) unless `AllowInsecureConnections` is explicitly enabled.
+
+