Get string from Server.UrlEncode as uppercase

Question

I want its output as uppercase. This is what I get on Server.UrlEncode("http://"):

http%3a%2f%2f

but I need:

http%3A%2F%2F

Is there built-in solution in C#?

The url encoded shall serve as signature base string (input to signature algorithm) to create digest (hash). The hash will then be verified by other system (java,php,etc), so they need to recreate the hash by signature reconstruction first.

This matters for something like OAuth where the difference between %2f and %2F is enough to make your signature invalid - oauth.net/core/1.0/#encoding_parameters — Nathan Friedly
– Nathan Friedly, Commented Jul 6, 2013 at 0:00

salle55 · Accepted Answer · 2013-05-15 11:30:14Z

34

This will uppercase all escaped characters in your string.

string url = "http://whatever.com/something";
string lower = Server.UrlEncode(url);
Regex reg = new Regex(@"%[a-f0-9]{2}");
string upper = reg.Replace(lower, m => m.Value.ToUpperInvariant());

edited May 15, 2013 at 11:30

salle55

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answered Jun 16, 2011 at 11:37

agent-j

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6 Comments

lax Over a year ago

that's its agent-j, but without extra ")", Thanks!

SAGExSDX Over a year ago

thanks for this. For some reason Twitter's OAuth requires the escaped characters to be in uppercase or else it'll give you 401 unauthorized

Nathan Friedly Over a year ago

Thanks! (BTW, the reason this is necessary for OAuth is that the entire URL ("http://" and all) is URLEncoded and then signed. The OAuth 1.0 spec requires uppercase hexadicemal for encoded characters, but the .net UrlEncode produces lowercase - the difference causes the signatures to not match.)

Cham Over a year ago

@SAGExSDX: I have uppercase the url that needed to create the oauth_signature. But it still give me the 401 error. If you have the C# code, can you share it me please ?

SAGExSDX Over a year ago

@user1457039 var lower = HttpUtility.UrlEncode(strText); var reg = new Regex(@"%[a-f0-9]{2}"); return reg.Replace(lower, m => m.Value.ToUpperInvariant()); It's the same as the above answer.

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PlushEngineCell · Accepted Answer · 2018-01-17 12:54:23Z

25

Uri.EscapeDataString("http://")

This code return

http%3A%2F%2F

answered Jan 17, 2018 at 12:54

PlushEngineCell

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3 Comments

Jon Kump Over a year ago

my favorite. Why use regex when you can use this?

Mr Rowe Over a year ago

This the correct answer: If you had used HttpUtility.UrlEncode('http://'); to encode it would incorrectly return lowercase encode letters, which I was incorrectly using for signatures in Oauth http requests.

Stack Man Over a year ago

This doesn't escape square brackets: []

Saed Swedan · Accepted Answer · 2020-11-26 11:18:23Z

8

I encountered the same problem, I found the answer in this link:

WebUtility.UrlEncode or HttpUtility.UrlEncode

in-short you can use:

System.Net.WebUtility.UrlEncode

which encodes into uppercase hex values

answered Nov 26, 2020 at 11:18

Saed Swedan

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Comments

SeregaKa · Accepted Answer · 2015-02-19 11:39:10Z

3

This is very easy

Regex.Replace( encodedString, @"%[a-f\d]{2}", m => m.Value.ToUpper() )

I.e. replace all hex letter-digit combinations to upper case

answered Feb 19, 2015 at 11:39

SeregaKa

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Comments

Dan Diplo · Accepted Answer · 2011-06-16 11:34:17Z

0

Assuming "http" is always the first four characters then you simply split the string after "http", UrlEncode that part and then call ToUpper() on it. Then join back together with "http" as your prefix.

answered Jun 16, 2011 at 11:34

Dan Diplo

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