fluttercommunity/flutter_webview_plugin

onHttpError called with a 200 code

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#414 opened on May 9, 2019

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IOSbughelp wanted

Description

I'm using this plugin for a payment process (using a bank web interface). I first load a generated HTML page (given a Uri.dataFromString() with mimeType sets to text/html) that build a form that auto-submit with action field sets to the bank server URL (where you enter your credit card information).

This workflow works fine on Android but I'm having a strange behavior on iOS. Right after the state changed to WebViewState.startLoad (with the bank server URL), onHttpError is triggered with a HTTP 200 code.

I initially quit the webview when an error occur to show a message. So I add a test to avoid false error codes and the web page works fine despite the error.

My app use the latest version (0.3.5).

I would like to know what can cause this behavior, I tried to put breakpoints in Xcode to have more info directly from the WKWebView didFailNavigation (inside FlutterWebviewPlugin.m) but my breakpoint is never hit...

EDIT: Putting the breakpoint in WKWebView decidePolicyForNavigationResponse works. Reading the code inside this method I noticed that there is no test to determined if the response is effectively an error.

Contributor guide

Tech stack
flutterobjective c
Domain
mobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Flutter basicsiOS development setupObjective C reading
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65
Research direction
Investigate the iOS native code in FlutterWebviewPlugin.m, specifically the 'decidePolicyForNavigationResponse' method. Add a condition to check if the HTTP response status code indicates an error before calling the onHttpError callback. Refer to the WKWebView documentation for proper error detection.