https://www.some-api.com/login?name=Lee&pwd=123456

 var url = "http://www.some-api.com"
           .AppendPathSegment("login")
           .SetQueryParams(new
           {
               name = "Lee",
               pwd = "123456" 
           });  

var url = new Uri("http://www.some-api.com").AppendPathSegment(...

using Flurl;
using Flurl.Http;

var result = await "http://www.some-api.com".AppendPathSegment("login").GetAsync();

T poco = await "http://api.foo.com".GetJsonAsync<T>();
string text = await "http://site.com/readme.txt".GetStringAsync();
byte[] bytes = await "http://site.com/image.jpg".GetBytesAsync();
Stream stream = await "http://site.com/music.mp3".GetStreamAsync();

await "http://api.foo.com".PostJsonAsync(new { a = 1, b = 2 });

dynamic d = await "http://api.foo.com".GetJsonAsync();

await url.WithHeader("Accept", "text/plain").GetJsonAsync();

await url.WithHeaders(new { Accept = "text/plain", User_Agent = "Flurl" }).GetJsonAsync();

await url.WithBasicAuth("username", "password").GetJsonAsync();

await url.WithOAuthBearerToken("mytoken").GetJsonAsync();

await "http://site.com/login".PostUrlEncodedAsync(new { 
    user = "user", 
    pass = "pass"
});