[Web]URL Encoding 簡單的介紹

昨天客戶那邊給了一個bug,問題是說"加密後的資料"傳到WebService時,解密的時候會出現錯誤,導致程式結果錯誤


為了這個問題,我仔細的看了自己的WebService的解密方式,也確認了與客戶當初所說的一致


但客戶給了SampleCode裡的加解密方式,當初是原封不動的加入程式再呼叫而已...問題出在哪?


為此問題找了一下解答,才發現,
是客戶"加密後的資料",雖用同一支SamlpeCode加密而成,但並未使用HttpUtility.HtmlEncode(),導致好死不死的,加密後的資料有20%3d%3d,
而在WebService裡又使用HttpUtility.HtmlDecode()先轉譯,導致20的部份轉譯成"空白",
傳入SamlpeCode裡解密時,造成64bit長度不符的Exception
(好笑的是我花了兩個小時才發現,之前用debug的方式在找,都看不出來,
直到貼到notepad上才看到~昏倒)

為此找個一些資料做整理,原始出處於URL Encoding

"Reserved characters"
	Why:	URLs use some characters for special use in defining their syntax. When these characters are not used in their special role inside a URL, they need to be encoded.
	Characters:	Character Code Points (Hex) Code Points (Dec)  Dollar ("$")  Ampersand ("&")  Plus ("+")  Comma (",")  Forward slash/Virgule ("/")  Colon (":")  Semi-colon (";")  Equals ("=")  Question mark ("?")  'At' symbol ("@") 24 26 2B 2C 2F 3A 3B 3D 3F 40 36 38 43 44 47 58 59 61 63 64

"Unsafe characters"
	Why:	Some characters present the possibility of being misunderstood within URLs for various reasons. These characters should also always be encoded.
	Characters:	Character Code Points (Hex) Code Points (Dec) Why encode? Space 20 32 Significant sequences of spaces may be lost in some uses (especially multiple spaces) Quotation marks 'Less Than' symbol ("<") 'Greater Than' symbol (">") 22 3C 3E 34 60 62 These characters are often used to delimit URLs in plain text. 'Pound' character ("#") 23 35 This is used in URLs to indicate where a fragment identifier (bookmarks/anchors in HTML) begins. Percent character ("%") 25 37 This is used to URL encode/escape other characters, so it should itself also be encoded. Misc. characters:    Left Curly Brace ("{")    Right Curly Brace ("}")    Vertical Bar/Pipe ("|")    Backslash ("\")    Caret ("^")    Tilde ("~")    Left Square Bracket ("[")    Right Square Bracket ("]")    Grave Accent ("`") 7B 7D 7C 5C 5E 7E 5B 5D 60 123 125 124 92 94 126 91 93 96 Some systems can possibly modify these characters.

看到了嗎?就是因為出現"20"導致Decode時,將之轉成"空白"~真是冤忘阿!!

哈哈~要來去跟客戶請錢了,竟然害我做白工~~

以上