[Webkit-unassigned] [Bug 144912] New: WKWebView should expose _loadAlternateHTMLString:baseURL:forUnreachableURL:

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=144912

            Bug ID: 144912
           Summary: WKWebView should expose
                    _loadAlternateHTMLString:baseURL:forUnreachableURL:
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: stefan at arentz.ca

Exposing WKWebView#_loadAlternateHTMLString:baseURL:forUnreachableURL: would allow people to us show error messages in-content while maintaining a sane BackForwardList.

The problem with the alternatives, loadHTML or loadRequest from an embedded HTTP Server, do not play well with the (read-only) BackForwardList.

When presenting an error with loadHTML, it will *replace* the current page you are on.

When presenting an error with loadRequest, either from embedded server or file: URL, it will generate a new entry in the BackForwardList that you cannot get rid of.

The _loadAlternateHTMLString:baseURL:forUnreachableURL API seems to add the failing page to the BackForwardList while presenting alternative content, like an error message. This means a call to reloadFromOrigin will simply retry the page and leave the BackForwardList in a good state that makes sense.

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