url encoding c# mismatch encoding

Question

I have a large url that I am encoding using System.Web.HttpUtility.UrlEncode. When I encode it its not encoding it like the working example I have. I am not sure what the problem is, maybe different character type or something, I put an example of what suppose to be created and what actually being created. thanks for any help, i am lost on this one.

Working exmaple (look how this one has Did%252Citag%252 and the other doesnt)

22%7Chttp%3A%2F%2Fv17.nonxt1.googlevideo.com%2Fvideoplayback%3Fid%3D0b608733ae5257c3%26itag%3D22%26source%3Dpicasa%26ip%3D0.0.0.0%26ipbits%3D0%26expire%3D1333533157%26sparams%3Did%252Citag%252Csource%252Cip%252Cipbits%252Cexpire%26signature%3D8AD67D74F34FBAFBBA87616C0AED4A336DF0982A.129E2B5E648F8A2F35A34F312AC5C3C957A1C40A%26key%3Dlh1%2C35%7Chttp%3A%2F%2Fv18.nonxt3.googlevideo.com%2Fvideoplayback%3Fid%3D0b608733ae5257c3%26itag%3D35%26source%3Dpicasa%26ip%3D0.0.0.0%26ipbits%3D0%26expire%3D1333533157%26sparams%3Did%252Citag%252Csource%252Cip%252Cipbits%252Cexpire%26signature%3D7A58A11994C710872E945D0EAA6E43B6BFB8A648.B9C1D9FB377E1A49EBF3DC6C166C0B6E3E94EC24%26key%3Dlh1%2C34%7Chttp%3A%2F%2Fv6.nonxt1.googlevideo.com%2Fvideoplayback%3Fid%3D0b608733ae5257c3%26itag%3D34%26source%3Dpicasa%26ip%3D0.0.0.0%26ipbits%3D0%26expire%3D1333533157%26sparams%3Did%252Citag%252Csource%252Cip%252Cipbits%252Cexpire%26signature%3D260B10850A3448C849B8B8F1F2AF5E31244E71BC.6D7420FD66B85D40982BFB2C847EDB46021C63AE%26key%3Dlh1%2C5%7Chttp%3A%2F%2Fv23.nonxt7.googlevideo.com%2Fvideoplayback%3Fid%3D0b608733ae5257c3%26itag%3D5%26source%3Dpicasa%26ip%3D0.0.0.0%26ipbits%3D0%26expire%3D1333533157%26sparams%3Did%252Citag%252Csource%252Cip%252Cipbits%252Cexpire%26signature%3D9894DCDA7D2634EE0006CE0F6E0E29ABF7A8F253.18765D7CD7BDE80ED1A47DC8EC559C3E05C92F56%26key%3Dlh1

Here is an example of the one I am creating (see this one encodes as did%2citag%2)

5%7chttp%3a%2f%2fv23.nonxt7.googlevideo.com%2fvideoplayback%3fid%3d0b608733ae5257c3%26itag%3d5%26source%3dpicasa%26ip%3d0.0.0.0%26ipbits%3d0%26expire%3d1333562840%26sparams%3did%2citag%2csource%2cip%2cipbits%2cexpire%26signature%3dC0E2993011931D9F5FCAFAF54E821415F6042DDD.477CD23B021563A6DE30E858E35C21046E0B0BA6%26key%3dlh1%2c18%7chttp%3a%2f%2fv11.nonxt4.googlevideo.com%2fvideoplayback%3fid%3d0b608733ae5257c3%26itag%3d18%26source%3dpicasa%26ip%3d0.0.0.0%26ipbits%3d0%26expire%3d1333562840%26sparams%3did%2citag%2csource%2cip%2cipbits%2cexpire%26signature%3d696501A8ACBA0E1246173B040E0FB81DA8EBCDC7.944BA6C08C630EFFC2456D66BAD12376D7E377B2%26key%3dlh1%2c34%7chttp%3a%2f%2fv6.nonxt1.googlevideo.com%2fvideoplayback%3fid%3d0b608733ae5257c3%26itag%3d34%26source%3dpicasa%26ip%3d0.0.0.0%26ipbits%3d0%26expire%3d1333562840%26sparams%3did%2citag%2csource%2cip%2cipbits%2cexpire%26signature%3dDDD3D9081F7F2FF462D17CFAE6CAB72AEB86DEA9.3275E0EE8921EF728132035FC94BEF5926A0B7C1%26key%3dlh1%2c35%7chttp%3a%2f%2fv18.nonxt3.googlevideo.com%2fvideoplayback%3fid%3d0b608733ae5257c3%26itag%3d35%26source%3dpicasa%26ip%3d0.0.0.0%26ipbits%3d0%26expire%3d1333562840%26sparams%3did%2citag%2csource%2cip%2cipbits%2cexpire%26signature%3d7826E7470450F9F473BC7A845967EF3AC655CFB.3850F952F5D68151D325CD754C581CD66B0BC4D7%26key%3dlh1%2c22%7chttp%3a%2f%2fv17.nonxt1.googlevideo.com%2fvideoplayback%3fid%3d0b608733ae5257c3%26itag%3d22%26source%3dpicasa%26ip%3d0.0.0.0%26ipbits%3d0%26expire%3d1333562840%26sparams%3did%2citag%2csource%2cip%2cipbits%2cexpire%26signature%3d32FAAE6AE74B22BFB3DBD4300CEEDBC1A12A9ED4.8014678ABB1AEE93FB4B1C36E2C74C89102DC112%26key%3dlh1

Answer 1

Looks like in the first example the URL is double encoded. Meaning if you look at decoded sparams parameter it is represented as

sparams=id%2Citag%2Csource%2Cip%2Cipbits%2Cexpire

In your second example

sparams=id,itag,source,ip,ipbits,expire

So, what is happening in the first example is that, they are doing a UrlEncode on the value first. Using this value Construct the URL and then do UrlEncode on the constructed URL.

UPDATE : This is a general practice to be followed if the value of your querystring contains values which needs to be UrlEncoded (eg. , & space ? etc)

Answer 2

I'm not sure exactly what you are expecting, but when you fire these strings into a URL Decoder, this is what you get:

String 1

22|http://v17.nonxt1.googlevideo.com/videoplayback?id=0b608733ae5257c3&itag=22&source=picasa&ip=0.0.0.0&ipbits=0&expire=1333533157&sparams=id%2Citag%2Csource%2Cip%2Cipbits%2Cexpire&signature=8AD67D74F34FBAFBBA87616C0AED4A336DF0982A.129E2B5E648F8A2F35A34F312AC5C3C957A1C40A&key=lh1,35|http://v18.nonxt3.googlevideo.com/videoplayback?id=0b608733ae5257c3&itag=35&source=picasa&ip=0.0.0.0&ipbits=0&expire=1333533157&sparams=id%2Citag%2Csource%2Cip%2Cipbits%2Cexpire&signature=7A58A11994C710872E945D0EAA6E43B6BFB8A648.B9C1D9FB377E1A49EBF3DC6C166C0B6E3E94EC24&key=lh1,34|http://v6.nonxt1.googlevideo.com/videoplayback?id=0b608733ae5257c3&itag=34&source=picasa&ip=0.0.0.0&ipbits=0&expire=1333533157&sparams=id%2Citag%2Csource%2Cip%2Cipbits%2Cexpire&signature=260B10850A3448C849B8B8F1F2AF5E31244E71BC.6D7420FD66B85D40982BFB2C847EDB46021C63AE&key=lh1,5|http://v23.nonxt7.googlevideo.com/videoplayback?id=0b608733ae5257c3&itag=5&source=picasa&ip=0.0.0.0&ipbits=0&expire=1333533157&sparams=id%2Citag%2Csource%2Cip%2Cipbits%2Cexpire&signature=9894DCDA7D2634EE0006CE0F6E0E29ABF7A8F253.18765D7CD7BDE80ED1A47DC8EC559C3E05C92F56&key=lh1

String 2

5|http://v23.nonxt7.googlevideo.com/videoplayback?id=0b608733ae5257c3&itag=5&source=picasa&ip=0.0.0.0&ipbits=0&expire=1333562840&sparams=id,itag,source,ip,ipbits,expire&signature=C0E2993011931D9F5FCAFAF54E821415F6042DDD.477CD23B021563A6DE30E858E35C21046E0B0BA6&key=lh1,18|http://v11.nonxt4.googlevideo.com/videoplayback?id=0b608733ae5257c3&itag=18&source=picasa&ip=0.0.0.0&ipbits=0&expire=1333562840&sparams=id,itag,source,ip,ipbits,expire&signature=696501A8ACBA0E1246173B040E0FB81DA8EBCDC7.944BA6C08C630EFFC2456D66BAD12376D7E377B2&key=lh1,34|http://v6.nonxt1.googlevideo.com/videoplayback?id=0b608733ae5257c3&itag=34&source=picasa&ip=0.0.0.0&ipbits=0&expire=1333562840&sparams=id,itag,source,ip,ipbits,expire&signature=DDD3D9081F7F2FF462D17CFAE6CAB72AEB86DEA9.3275E0EE8921EF728132035FC94BEF5926A0B7C1&key=lh1,35|http://v18.nonxt3.googlevideo.com/videoplayback?id=0b608733ae5257c3&itag=35&source=picasa&ip=0.0.0.0&ipbits=0&expire=1333562840&sparams=id,itag,source,ip,ipbits,expire&signature=7826E7470450F9F473BC7A845967EF3AC655CFB.3850F952F5D68151D325CD754C581CD66B0BC4D7&key=lh1,22|http://v17.nonxt1.googlevideo.com/videoplayback?id=0b608733ae5257c3&itag=22&source=picasa&ip=0.0.0.0&ipbits=0&expire=1333562840&sparams=id,itag,source,ip,ipbits,expire&signature=32FAAE6AE74B22BFB3DBD4300CEEDBC1A12A9ED4.8014678ABB1AEE93FB4B1C36E2C74C89102DC112&key=lh1

You URLS are quite different, and they also have a leading chars that I'm not sure you are wanting.

Answer 3

According to w3c standards, your example is fine. There is no %252 symbol.