Sending special character for a web-api project

Question

Hi all enthusiastics programmers. I am making a get call from a C# client towards a web-api Project The code looks like below

 private const string Url = "http://localhost:61809/"; public ItemService() { _httpClient.DefaultRequestHeaders.Accept.Clear(); _httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); } public async Task<IEnumerable<Item>> GetItemsAsync(string searchString) { List<Items> = null; string path = @"api/item/" + searchString; HttpResponseMessage response = await _httpClient.GetAsync(Url+path).ConfigureAwait(false); if (response.IsSuccessStatusCode) { items = await response.Content.ReadAsAsync<List<Item>>().ConfigureAwait(false); } return items; }

Everything works but if a look after a item whcih contains the character # it fails. If i looks for the item i.e Mastering C# it fails. I have debugged this on the backend side also and the content on the backend doesn't contain the character #. The content is Mastering C which of course fails. The same occurs if i sent the request from Postman What can i do to get it works? Some special encoding or configuration of the backend code?

try using System.Web.HttpUtility.UrlEncode(path)

S.Dav
– S.Dav

2017-03-31 12:32:54 +00:00
Commented Mar 31, 2017 at 12:32 — S.Dav
– S.Dav, Commented Mar 31, 2017 at 12:32

Stephen Cleary · Accepted Answer · 2017-03-31 13:22:34Z

Yes, you do need to encode it. I'm in the process of writing a library that does this correctly, but it's not released yet.

In the meantime, you can use percent encoding as such:

public class UrlEncoding { public static Encoding Utf8EncodingWithoutBom { get; } = new UTF8Encoding(encoderShouldEmitUTF8Identifier: false); public static string PercentEncodePathSegment(string value) { var bytes = Utf8EncodingWithoutBom.GetBytes(value); var sb = new StringBuilder(bytes.Length); foreach (var ch in bytes) { if (ch == '-' || ch == '.' || ch == '_' || ch == '~' || (ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'Z') || ch == '!' || ch == '$' || ch == '&' || ch == '\'' || ch == '(' || ch == ')' || ch == '*' || ch == '+' || ch == ',' || ch == ';' || ch == '=' || ch == ':' || ch == '@') { sb.Append((char)ch); } else { sb.Append("%" + ch.ToString("X2", CultureInfo.InvariantCulture)); } } return sb.ToString(); } }

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