perf: await context.request.body() taking 600ms to process

[Schamppu]

Description

I have an endpoint that only uses root middleware to setup CORS for Shelf, like so:

Handler middleware(Handler handler) {
  return handler.use(requestLogger()).use(
        fromShelfMiddleware(
          shelf.corsHeaders(
            headers: {
              shelf.ACCESS_CONTROL_ALLOW_ORIGIN: '${Platform.environment['CORS_ACCEPTED_ORIGIN']!}',
              shelf.ACCESS_CONTROL_ALLOW_METHODS: 'GET, POST, PUT, DELETE, OPTIONS',
              shelf.ACCESS_CONTROL_ALLOW_HEADERS: 'Content-Type, Authorization',
              shelf.ACCESS_CONTROL_ALLOW_CREDENTIALS: 'true',
              shelf.ACCESS_CONTROL_MAX_AGE: '86400',
            },
          ),
        ),
      );
}

I run the following code in my endpoint:

final stopWatch = Stopwatch()..start();
final body = await context.request.body();
print('Request body took ${stopWatch.elapsedMilliseconds}ms');
print('Body was ${utf8.encode(body).lengthInBytes} bytes.');
stopWatch.stop();

Which gives me the following result, when using a very short request body (218 bytes):

With a longer request, the time it takes to await is practically the same:

600ms when calling await context.request.body() is way too long, and causes a performance bottleneck.

Requirements

• [ ] All CI/CD checks are passing.
• [ ] There is no drop in the test coverage percentage.

Additional Context

Additional information:

• Test was ran locally using dart_frog dev
• Running on Dart Frog 1.1.0, according to pubspec.lock
• Using shelf_cors_headers 0.1.5
• Request data is compressed and encrypted when sent to Dart Frog server, but there was no difference that I found when not using compression/encryption.
• I tried running without the CORS headers middleware, and the result was the same.
• Very rarely the time to load the body was 0ms. This makes me think it's a caching issue.

[wolfenrain]

Can you provide the shelf version that is being used? You should be able to find that in your pubspec.lock

[Schamppu]

Shelf version from pubspec.lock is 1.4.2