Update src/router.ps1

src/router.ps1

@@ -4,49 +4,47 @@ function Invoke-TasksCompleted {
     Send-Text $Context "Tasks completion acknowledged."
 }
 
-
 function Dispatch-Request {
     param($Context)
 
-    # Guard against null contexts (prevents "null-valued expression" crashes)
     if ($null -eq $Context -or $null -eq $Context.Request -or $null -eq $Context.Request.Url) {
-        try {
-            if ($Context -and $Context.Response) {
-                $Context.Response.StatusCode = 400
-                $Context.Response.Close()
-            }
-        } catch { }
         return
     }
 
-    # Normalize path
+    try {
         $path = $Context.Request.Url.AbsolutePath.TrimStart('/')
 
         switch -Regex ($path) {
 
             '^$' {
                 $html = Get-UIHtml -Page 'onboard'
-            return Send-HTML $Context $html
+                Send-HTML $Context $html
+                return
             }
 
             '^samy\.js$' {
-            return Send-RemoteAsset -Context $Context -Url $Script:SamyJsUrl -ContentType 'application/javascript; charset=utf-8'
+                Send-RemoteAsset -Context $Context -Url $Script:SamyJsUrl -ContentType 'application/javascript; charset=utf-8'
+                return
             }
 
             '^samy\.css$' {
-            return Send-RemoteAsset -Context $Context -Url $Script:SamyCssUrl -ContentType 'text/css; charset=utf-8'
+                Send-RemoteAsset -Context $Context -Url $Script:SamyCssUrl -ContentType 'text/css; charset=utf-8'
+                return
             }
 
             '^SVS_logo\.svg$' {
-            return Send-RemoteAsset -Context $Context -Url $Script:SamyTopLogoUrl -ContentType 'image/svg+xml'
+                Send-RemoteAsset -Context $Context -Url $Script:SamyTopLogoUrl -ContentType 'image/svg+xml'
+                return
             }
 
             '^SAMY\.png$' {
-            return Send-RemoteAsset -Context $Context -Url $Script:SamyBgLogoUrl -ContentType 'image/png'
+                Send-RemoteAsset -Context $Context -Url $Script:SamyBgLogoUrl -ContentType 'image/png'
+                return
             }
 
             '^SVS_Favicon\.ico$' {
-            return Send-RemoteAsset -Context $Context -Url $Script:SamyFaviconUrl -ContentType 'image/x-icon'
+                Send-RemoteAsset -Context $Context -Url $Script:SamyFaviconUrl -ContentType 'image/x-icon'
+                return
             }
         }
 
@@ -63,7 +61,6 @@ function Dispatch-Request {
         if ($Context.Request.HttpMethod -eq 'POST' -and $path -eq 'getprinters')    { Invoke-GetPrinters $Context; return }
         if ($Context.Request.HttpMethod -eq 'POST' -and $path -eq 'installprinters'){ Invoke-InstallPrinters $Context; return }
 
-    # Only locally-generated pages (root is handled above)
         if ($path -in @('onboard', 'offboard', 'devices')) {
             $html = Get-UIHtml -Page $path
             Send-HTML $Context $html
@@ -93,4 +90,20 @@ function Dispatch-Request {
 
         $Context.Response.StatusCode = 404
         Send-Text $Context '404 - Not Found'
+    }
+    catch {
+        # Always return something so clients don't hang
+        try {
+            $Context.Response.StatusCode = 500
+            $msg = "Dispatch error: $($_.Exception.Message)"
+            $bytes = [Text.Encoding]::UTF8.GetBytes($msg)
+            $Context.Response.ContentType = 'text/plain; charset=utf-8'
+            $Context.Response.ContentLength64 = $bytes.Length
+            $Context.Response.OutputStream.Write($bytes, 0, $bytes.Length)
+        } catch { }
+    }
+    finally {
+        try { $Context.Response.OutputStream.Close() } catch { }
+        try { $Context.Response.Close() } catch { }
+    }
 }