如果您訂閱了我的新聞通訊已有一段時(shí)間，則可能已經(jīng)注意到我有幾周沒(méi)有發(fā)送電子郵件了。 事實(shí)證明，我管理過(guò)我的RSS feed，您也可以這樣做一個(gè)簡(jiǎn)單的把戲。

Backstory

In case you’re not a regular subscriber, here’s the situation. Every Friday at noon, I send an automated email to all of my subscribers using MailChimp. For simplicity, that email is generated using my RSS feed. Specifically, each week an email is created from the two posts from the previous week.

好吧，在某個(gè)時(shí)候，我的常規(guī)每周電子郵件都變得黑了：

如您所見(jiàn)，我于8月9日發(fā)送了一封電子郵件，然后直到8月24日我更正了該問(wèn)題之后，我才再次發(fā)送一封電子郵件。 換句話說(shuō)，有兩個(gè)星期的電子郵件遺漏。

有一次，當(dāng)我收到一封電子郵件，說(shuō)我有一個(gè)新訂戶時(shí)，我正在外面。 突然，我意識(shí)到自己有一段時(shí)間沒(méi)有收到自己的一封電子郵件，因此我決定進(jìn)行調(diào)查。 是的，我的自動(dòng)電子郵件已經(jīng)失效了一段時(shí)間。

Investigation

當(dāng)我回到家時(shí)，我決定跳上我的MailChimp帳戶，看看是否可以找到任何問(wèn)題。 由于我沒(méi)有任何通知，因此我認(rèn)為執(zhí)行IT部門通常的做法可能是個(gè)好主意：關(guān)閉并打開(kāi)自動(dòng)電子郵件。 不幸的是，我無(wú)法重新打開(kāi)電子郵件。

According to MailChimp, I didn’t have a proper RSS feed. In the past, one of my plugins messed up my feed, so I was thinking maybe that was the issue. Of course, I didn’t trust MailChimp, so I grabbed my RSS feed and dropped it into an RSS validator.

When I did that, I found that MailChimp was actually telling the truth. Apparently, there was some part of my feed which wasn’t properly formed. Fortunately, the validator was able to give me the exact line. When I investigated further, I realized it was an issue with a singular character in one of my articles.

如果您點(diǎn)擊該鏈接，您將被帶到一篇無(wú)害的文章。 通常，本文的前提是共享有關(guān)Java中不同原始類型的一些詳細(xì)信息。 當(dāng)然，對(duì)于每種原始類型，我決定共享它們的范圍。 那是我遇到問(wèn)題的時(shí)候。

One Tip to Nuke Your RSS Feed

如果您熟悉Java，則可能知道字符不是8位。 相反，它們是16位的，這意味著它們的范圍從0擴(kuò)展到65,535。 當(dāng)然，并非所有這些字符都有效。

例如，在有關(guān)原始類型的文章中，我決定使用以下命令演示字符范圍：

Character.MIN_VALUE // Prints the character at index 0
Character.MAX_VALUE // Prints the character at index 65,535

當(dāng)然，當(dāng)我寫這篇文章時(shí)，我實(shí)際上展示了這個(gè)角色：

當(dāng)我將該方框字符粘貼到文章中時(shí)，WordPress從未真正抱怨過(guò)。 實(shí)際上，它的呈現(xiàn)方式與文章中的描述完全相同，而且我并沒(méi)有真正注意到任何問(wèn)題。

不幸的是，距離我對(duì)RSS feed的影響還差了兩個(gè)星期。 解決此問(wèn)題后，那天晚上我轉(zhuǎn)身并發(fā)送了一封電子郵件。

Moral of the Story

事實(shí)證明，某些字符在RSS中被視為無(wú)效。 不幸的是，除了論壇上的一些低質(zhì)量帖子外，我找不到關(guān)于此問(wèn)題的任何文檔。

如果我不得不猜測(cè)的話，XML規(guī)范中有一個(gè)非法字符列表。 結(jié)果，RSS規(guī)范繼承了那些非法字符，甚至可能添加到其中。 如果有人對(duì)這種問(wèn)題有更多的了解，請(qǐng)告訴我。

At any rate, after this happened, I told one of my friends—Robert—about it, and he thought it was hilarious. Ever since, he’s been dumping that box character into all sorts of interfaces including Discord and iMessage. So far, we haven’t seen any issues. However, it does render differently depending on the platform.

After chatting, we remembered there used to be a funny character related bug in chrome which would crash the browser. In fact, a lot of people were making funny games where you would have to avoid touching buttons that would load the character. If you’re interested in that sort of thing, I found an article from 2015 that details the whole saga.

Help Grow The Renegade Coder

好吧，一天的樂(lè)趣就足夠了。 如果您喜歡這種內(nèi)容，我不介意分享有關(guān)所遇到的錯(cuò)誤的信息。 地獄，這實(shí)際上可能是一個(gè)有趣的新系列。

Regardless, thanks again for your support. If you’d like to show a little extra, head on over to Patreon where you can toss me a couple bucks for my efforts. Also, you’re welcome to join the mailing list where you’ll receive one email a week.

當(dāng)您在這里時(shí)，我有更多的內(nèi)容來(lái)自：

• How to Spot a Bad Mentor (Premium)
• How I Almost Built a Twitter Bot
• How to Clean Your WordPress Database

與往常一樣，感謝您的光臨！

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