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		<header>
			<h1><code>ErrorDocument</code> pages</h1>
			<p>Day 00603: Sunday, 2016 October 30</p>
		</header>
<img src="/img/CC_BY-SA_4.0/y.st./weblog/2016/10/30.jpg" alt="A cat and a chicken hanging out in a driveway" class="weblog-header-image" width="811" height="480" />
<p>
	Current countdowns:
</p>
<ul>
	<li>249 scheme-specific <abbr title="Uniform Resource Identifier">URI</abbr>-parsing classes to write and add to <a href="https://git.vola7ileiax4ueow.onion/y.st./include.d/releases">include.d</a></li>
	<li>1 free elective left in my associate degree program</li>
	<li>4 free electives left in my bachelor degree program</li>
</ul>
<p>
	Topics for essays that I want to write outside of school:
</p>
<ul>
<li>How the <abbr title="GNU &quot;Free&quot; Documentation License">GFDL</abbr> isn&apos;t a free license, and is effectively nonfree even when invariant sections aren&apos;t used</li>
<li>How the telephone number system is screwy</li>
<li>How postpaid mobile plans are bad for customers</li>
<li>How connections using &quot;untrusted&quot; <abbr title="Transport Layer Security">TLS</abbr> certificates are more trustworthy than connections without any <abbr title="Transport Layer Security">TLS</abbr> certificate at all</li>
<li>The importance of free software</li>
<li>The importance of free media</li>
</ul>
<p>
	I printed my resume, then walked it in to my former place of employment.
	Hopefully I can get a temporary job there.
</p>
<p>
	I made it today&apos;s project to complete the <code>ErrorDocument</code> pages for this website, but I quickly ran into issues.
	To better explain what the Web browser did wrong to cause the <abbr title="Hypertext Transfer Protocol">HTTP</abbr> <code>400</code> error, I mentioned that the most probable cause was the <abbr title="Server Name Indication">SNI</abbr> bug present in most Web browsers, then included the full article on the error page.
	I obviously couldn&apos;t link to the actual page that the article appears on, after all, because broken Web clients will cause the <code>400</code> error to appear there as well.
	The next issue was the <abbr title="Cascading Style Sheets">CSS</abbr>.
	To make the line between the error message and the optional article clear, <abbr title="Cascading Style Sheets">CSS</abbr> is a must, but if a Web client that has the <abbr title="Server Name Indication">SNI</abbr> bug reaches that error page, it&apos;ll trigger the error again with each of the style sheets.
	I could try to hack in a way to include the style sheets as part of the page, just like how I included the article in the page, but doing that is a bit complicated.
	I could put a toggle in the webpage template, despite only needing this feature for one page.
	If active, the <abbr title="Cascading Style Sheets">CSS</abbr> would be sanitized and included directly in the <abbr title="Extensible Hypertext Markup Language">XHTML</abbr>.
	Otherwise, it would be included as external style sheets.
	It seems very hacky to use such a toggle though when it&apos;s only needed on one page.
	The other option though is to set up a conditional in the template that specifically treats the <code>400</code> page as special.
	That seems even <strong>*more*</strong> hacky though.
	That said, the <code>400</code> page in many ways <strong>*is*</strong> special, so it makes some sense to treat it like that.
	In the end, that&apos;s what I decided to do.
</p>
<p>
	I&apos;ve attempted to place Vanessa&apos;s order again.
	This time, I tried to use the email address that I have on file with Discover during the order process, but the order form rejected that email address.
	There&apos;s nothing that I can do about that, so I just used the same email address that I used last time.
	I have little doubt that this order will fail just like the last one did.
</p>
<p>
	My <a href="/a/canary.txt">canary</a> still sings the tune of freedom and transparency.
</p>
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			Copyright © 2016 Alex Yst;
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			If for some reason you would prefer to modify and/or distribute this document under other free copyleft terms, please ask me via email.
			My address is in the source comments near the top of this document.
			This license also applies to embedded content such as images.
			For more information on that, see <a href="/en/a/licensing.xhtml">licensing</a>.
		</p>
		<p>
			<abbr title="World Wide Web Consortium">W3C</abbr> standards are important.
			This document conforms to the <a href="https://validator.w3.org./nu/?doc=https%3A%2F%2Fy.st.%2Fen%2Fweblog%2F2016%2F10-October%2F30.xhtml"><abbr title="Extensible Hypertext Markup Language">XHTML</abbr> 5.1</a> specification and uses style sheets that conform to the <a href="http://jigsaw.w3.org./css-validator/validator?uri=https%3A%2F%2Fy.st.%2Fen%2Fweblog%2F2016%2F10-October%2F30.xhtml"><abbr title="Cascading Style Sheets">CSS</abbr>3</a> specification.
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