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Network request failing ONLY in mobile network. On WIFI it does work as expected. #1752

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vidriloco opened this issue Apr 15, 2025 · 2 comments
Open

Network request failing ONLY in mobile network. On WIFI it does work as expected. #1752

vidriloco opened this issue Apr 15, 2025 · 2 comments
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needs-info Additional information needed from the issue author package:http type-bug Incorrect behavior (everything from a crash to more subtle misbehavior)

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@vidriloco
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vidriloco commented Apr 15, 2025 •
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Hello folks,

I have two Flutter apps running for a while already and I just noticed that the two of them are failing to complete a simple GET request but only when done using the mobile network. If I execute the request using the WIFI network, then there is no problem.

Here's the error I am getting:

flutter: Error fetching POIs after 3 attempts: ClientException with SocketException: Connection failed (OS Error: Network is unreachable, errno = 51), address = 0.78.103.114, port = 8000, uri=http://0.78.103.114:8000/pois/ flutter: Error: ClientException with SocketException: Connection failed (OS Error: Network is unreachable, errno = 51), address = 0.78.103.114, port = 8000, uri=http://0.78.103.114:8000/pois/

Below is the code that I am using to launch the request in one of those apps:

final response = await http.get(Uri.parse("http://$backendIPAddress:$backendPort/pois/")) .timeout(const Duration(seconds: 10));

Furthermore, I tested with a dummy endpoint serving a JSON and this one works correctly:

final testResponse = await http.get(Uri.parse('https://jsonplaceholder.typicode.com/todos/1')); print('Test API Response: ${testResponse.body}');

My device is running on iOS 18.1, just updated it to 18.4 to see if it made a difference, but none.

Here's my pubspec.yaml contents:

  sdk: ">=2.17.1 <3.0.0"

# Dependencies specify other packages that your package needs in order to work.
# To automatically upgrade your package dependencies to the latest versions
# consider running `flutter pub upgrade --major-versions`. Alternatively,
# dependencies can be manually updated by changing the version numbers below to
# the latest version available on pub.dev. To see which dependencies have newer
# versions available, run `flutter pub outdated`.
dependencies:
  flutter:
    sdk: flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2
  mapbox_gl: ^0.16.0
  rxdart: ^0.27.7
  latlong2: ^0.8.1
  lottie: ^1.4.2
  http: ^1.2.2
  timeago: ^3.2.2
  shared_preferences: ^2.2.2
  url_launcher: ^6.0.9
  mixpanel_flutter: ^2.0.0
  geolocator: ^11.1.0
  permission_handler: ^11.0.1
  flutter_html: ^3.0.0-beta.2
  intl: ^0.19.0
  photo_view: ^0.14.0
  flutter_staggered_grid_view: ^0.6.2
  flutter_cache_manager: ^3.4.1
  dots_indicator: ^2.1.1
  flutter_localizations:
    sdk: flutter
  json_annotation: ^4.8.1
  connectivity_plus: ^5.0.2

dev_dependencies:
  flutter_test:
    sdk: flutter

  # The "flutter_lints" package below contains a set of recommended lints to
  # encourage good coding practices. The lint set provided by the package is
  # activated in the `analysis_options.yaml` file located at the root of your
  # package. See that file for information about deactivating specific lint
  # rules and activating additional ones.
  flutter_lints: ^2.0.0
  json_serializable: ^6.7.1
  build_runner: ^2.4.7

# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

dependency_overrides:
  win32: ^5.5.4
@vidriloco vidriloco added package:http type-bug Incorrect behavior (everything from a crash to more subtle misbehavior) labels Apr 15, 2025
@itcozum
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itcozum commented Apr 23, 2025 •
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I'm having this very same issue.
can reach my API during development, but after release can't reach my API's.

@brianquinlan
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My reading of RFC-1700 is that {0, <Host-number>} is only routable on the local network and your destination IP is 0.78.103.114.

Is that the IP address that you meant to access from a mobile network?

@brianquinlan brianquinlan added the needs-info Additional information needed from the issue author label May 1, 2025
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