http.post sending no Content-Length

[deakjahn]

Steps to Reproduce

The following code:

final response = await http.post(url,
  headers: {
    'Content-Type': 'application/octet-stream',
    'Content-Length': (await fileSize(file)).toString(),
  },
  body: await fileRead(file));

(URL actually being the Google Cloud like https://www.googleapis.com/upload/storage/... returns the following error on Android:

411 Length Required

fileSize() reads the file size, fileRead() returns the content as an Uint8List. They both work all right. And yes, using the lower level approach with these calls:

final http = HttpClient();
final request = await http.postUrl(Uri.parse(url));
request.headers.set('Content-Type', 'application/octet-stream');
request.headers.set('Content-Length', await fileSize(file));
request.add(await fileRead(file));
final response = await request.close();
http.close();

works.

Doc

[√] Flutter (Channel beta, 1.18.0-11.1.pre, on Microsoft Windows [Version 10.0.18363.836], locale en-US)
    • Flutter version 1.18.0-11.1.pre at E:\Android\flutter-beta
    • Framework revision 2738a1148b (4 weeks ago), 2020-05-13 15:24:36 -0700
    • Engine revision ef9215ceb2
    • Dart version 2.9.0 (build 2.9.0-8.2.beta)

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.1)
    • Android SDK at e:\Android\Sdk
    • Platform android-29, build-tools 29.0.1
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • CHROME_EXECUTABLE = e:\Android\chrome.bat

[√] Android Studio (version 4.0)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 46.0.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] Connected device (2 available)
    • Web Server • web-server • web-javascript • Flutter Tools
    • Chrome     • chrome     • web-javascript • Google Chrome 83.0.4103.97

• No issues found!

[zichangg]

@deakjahn Thanks for filing the issue. I think this is a dart:io issue. I'll transfer to SDK and work on a fix.

[deakjahn]

Just make sure that the fix works in both mobile and Flutter Web. :-)

[sortie]

Closing since this is supposed to be fixed in 242ce27.