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"function htFileExists" stalls on a malformed URL (Windows) #352

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JoeJoeSoft opened this issue Aug 8, 2024 · 2 comments
Open

"function htFileExists" stalls on a malformed URL (Windows) #352

JoeJoeSoft opened this issue Aug 8, 2024 · 2 comments

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@JoeJoeSoft
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When a malformed URL is received as a link, using the form of "//site.com/path" with no leading "protocol:", the function htFileExists() will stall for about 30 seconds.

When this URL fails to load normally in THtmlViewer.LoadFromUrl(), the code tries to treat this as a file and converts to the form of "\site.com\path". Calling "ExpandFileName()" converts the slashes. The URL is treated as if it started with "file:" as the protocol.

When FileExists() is called in htFileExists(), the path is treated as a UNC path. Windows tries to locate a machine named "site.com" on the local network and hangs until it times out. This causes the program to freeze for about 30 seconds by default.
@BerndGabriel
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Could you please post an HTML example that hangs...
Thanks in advance.

@JoeJoeSoft
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Author

In the example below, the LINK tag triggers this behavior. It uses an HREF with no protocol.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd">
<HTML xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
<HEAD>
<LINK rel="stylesheet" type="text/css" href="//ct5.addthis.com/static/r07/widget091.css" media="all">
</HEAD>
<BODY>
<div>hello</div>
</BODY>
</HTML>

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@BerndGabriel @JoeJoeSoft