問題描述
決定 HTTP 標頭的字符集。我應該簡單地把 utf-8 和 fuggedaboutit 放在一起嗎？ (Deciding charset for HTTP Headers. Should i simply put utf-8 and fuggedaboutit?)
I was analyzing a page using Google Page Speed http://pagespeed.googlelabs.com/#url=http_3A_2F_2Fqweop.com&mobile=false&rule=SpecifyCharsetEarly
and it says that we should specify an explicit character set in HTTP Headers.
So basically my question is what determines what character set I should be using?
which character sets will have the least size / fastest ?
OR
What kind of savings can I have by using ASCII instead of say UTF-16 ?
Should i simply put utf-8 and fuggedaboutit ?
參考解法
方法 1:
You should include the charset that the page is encoded in. You'll want to be sure that you're telling the truth. For instance, there are a lot pages running around without a charset designation (and therefore being treated as UTF-8 or ISO-8859-1) which are actually encoded as Windows-1252. That's fine as long as you stick to character codes they have in common (certainly 32-127 and all the important control characters like newline, tab, etc.). But you start with any accented letters or special symbols, and suddenly your page doesn't look right cross-browser.
This article on charsets and Unicode by Joel Spolsky is well worth a read, if you haven't already.
方法 2:
Setting encoding in HTTP headers does not encode the page. It only tells browsers how the page is encoded and how they should treat it. So set the encoding in which the page is encoded.
If you want to decide which encoding to use, I would recommend UTF-8.
You can display all alphabetic characters of all languages (and much more) in UTF-8 encoding. There isn't any reason for use different encoding unless your pages need to be displayed by a device which does not support UTF-8 (such a device probably does not exist) or you have some very special requirements.
The performance impact of using different encoding is negligible as well as the page size.
(by Pacerier、T.J. Crowder、Petr Peller)