网址中的多字节字符未在呈现

我有一个bug问题。对于我制作的网站，有搜索引擎友好的URL生成。唯一的问题是在URL中有ß-chars。像ö，ï，ä，ü等字符被放置正确。但是ß-char有一个带有问号的菱形图标。 - >

I have a bugging problem. For a website I made there are search engine friendly URL's generated. The only problem is there are ß-chars in the url too. Chars like ö, ï, ä, ü etc. are placed correct. But with the ß-char there is a diamond-icon with a questionmark in it. -> �

我认为这与使用的字符集有关，但我已经试过UTF-8和iso-8859-1。两个都没有运气。

I thought it had to do with the charset which is used but i've tried both UTF-8 and iso-8859-1. Both without luck.

我需要在url中有正确的字符以便deeplink的可读性。

I need to have the correct character in the url for the readability of deeplinks.