private async Task InvokeCore(HttpContext context)
{
context.Response.Headers[HeaderNames.CacheControl] = "no-cache, no-store, must-revalidate, max-age=0";
if (!await _spaProxyLaunchManager.IsSpaProxyRunning(context.RequestAborted))
{
_spaProxyLaunchManager.StartInBackground(_hostLifetime.ApplicationStopping);
_logger.LogInformation("SPA proxy is not ready. Returning temporary landing page.");
context.Response.ContentType = "text/html";
await using var writer = new StreamWriter(context.Response.Body, Encoding.UTF8);
await writer.WriteAsync(GenerateSpaLaunchPage(_options.Value));
}
else
{
_logger.LogInformation($"SPA proxy is ready. Redirecting to {_options.Value.ServerUrl}.");
context.Response.Redirect(_options.Value.ServerUrl);
}
private async Task InvokeCore(HttpContext context)
{
context.Response.Headers[HeaderNames.CacheControl] = "no-cache, no-store, must-revalidate, max-age=0";
if (!await _spaProxyLaunchManager.IsSpaProxyRunning(context.RequestAborted))
{
_spaProxyLaunchManager.StartInBackground(_hostLifetime.ApplicationStopping);
_logger.LogInformation("SPA proxy is not ready. Returning temporary landing page.");
context.Response.ContentType = "text/html";
await using var writer = new StreamWriter(context.Response.Body, Encoding.UTF8);
await writer.WriteAsync(GenerateSpaLaunchPage(_options.Value));
}
else
{
_logger.LogInformation($"SPA proxy is ready. Redirecting to {_options.Value.ServerUrl}.");
context.Response.Redirect(_options.Value.ServerUrl);
}
string GenerateSpaLaunchPage(SpaDevelopmentServerOptions options)
{
return($@"
<!DOCTYPE html>
<html lang=""en"">
<head>
<meta charset = ""UTF-8"" >
<meta http-equiv=""X-UA-Compatible"" content=""IE=edge"">
<meta http-equiv=""refresh"" content=""3"">
<meta name=""viewport"" content=""width=device-width, initial-scale=1.0"">
<title>SPA proxy launch page</title>
</head>
<body>
<h1>Launching the SPA proxy...</h1>
<p>This page will automatically redirect to <a href=""{HtmlEncoder.Default.Encode(options.ServerUrl)}"">{HtmlEncoder.Default.Encode(options.ServerUrl)}</a> when the SPA proxy is ready.</p>
</body>
</html>");
}
}