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Use 200.html as a fallback before 404.html #190

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geelen
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@geelen geelen commented Sep 6, 2016

This is a convention I think makes a lot of sense for single page applications, when a URL doesn't match anything.

  • First check for /200.html and serve that with status 404
  • Then check for /404.html and serve that with status 404
  • Then serve a blank 404

This was introduced by harp (I think) and is used by surge.sh and it seems to be really straightforward to use.

I've made it so that if you set the config of handleError to false then this doesn't look for 200.html either, just to keep compatibility with other clients.

@jfhbrook
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Hey, just now seeing this. Will try to review in the next few days.

else {
// Try ./200.html before falling back to ./404.html
middleware({
url: '/' + path.join(baseDir, '200.' + defaultExt),
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This comma looks extraneous.

statusCode: 404
}, res, next);
}
else if (path.basename(parsed.pathname, defaultExt) === '200.') {
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This check seems brittle and awkward, and I don't think anyone else does it. Do you see a way around it? I don't, least not without a bigger refactor of ecstatic around passing state (which I want to do, but is kind of a whole thing).

I'll have to think about this.

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This would have never occurred to me.

statusCode: 404
}, res, next);
}
else {
// Try ./200.html before falling back to ./404.html
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@jfhbrook jfhbrook Sep 22, 2016

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It's mildly surprising that this isn't opt-in behavior, but 200.html wasn't used for anything else prior, right? So this is a breaking change, but that seems fine.

@jfhbrook
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So, uh, yeah! Github's new review feature is okay.

else {
// Try to serve default ./404.html
else if (!handleError) {
// If we're not handling errors/fallbacks, bail out now
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...is this a bug? I'll have to look more closely, but I think maybe handleError: false should have us be calling next directly.

@jfhbrook
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Last thought: Is this testable?

@jfhbrook
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I lied:

Do you think this PR solves a similar problem as #146 ?

@slorber
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slorber commented Nov 10, 2016

@jfhbrook it solves similar problem for me in a less flexible way.

In my case, I'd love to be able to give custom fallback page, and not rely on convention 200/404.html pages

@mk-pmb
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mk-pmb commented Oct 18, 2017

I wouldn't have expected any special 200/404 file behaviour either, as the README doesn't mention it.

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Feel free to PR some clarifying docs @mk-pmb

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4 participants