Top 20 NuGet http Packages

Lightweight Http Mocking Server for .Net, inspired by WireMock from the Java landscape.
Lightweight StandAlone Http Mocking Server for .Net.
Chilkat .NET Framework Class Library (32-bit) for SSH/SFTP, FTP, PDF, CAdES, XAdES, REST, POP3, SMTP, IMAP, SSL/TLS, Zip, REST, OAuth2, HTTP, RSA, XML DSig, Encryption, Compression, XML, Socket, XMP, HTML to XML, JSON, JWT, OAuth1, conversion, PKCS12/PFX, Java Keystore, ASN.1, PEM, ECC, Async, ...
Provides AppSelfHostBase implementation for .NET Core's Kestrel Self Host HTTP Server To get started see: https://servicestack.net/getting-started
.NET's fastest JSON, JSV and CSV Text Serializers. Fast, Light, Resilient. Contains ServiceStack's high-performance text-processing powers, for more info see: https://github.com/ServiceStack/ServiceStack.Text
A Serilog sink sending log events over HTTP.
A fluent, testable HTTP client library.
XML extensions to Flurl.Http
.NET's fastest JSON, JSV and CSV Text Serializers. Fast, Light, Resilient. Contains ServiceStack's high-performance text-processing powers, for more info see: https://github.com/ServiceStack/ServiceStack.Text
The buttoned-up and boring, but deeply analyzed, implementation of Signature Version 4 (SigV4) in .NET.
Chilkat .NET Framework Class Library (64-bit) for SSH/SFTP, FTP, PDF, CAdES, XAdES, REST, POP3, SMTP, IMAP, SSL/TLS, Zip, REST, OAuth2, HTTP, RSA, XML DSig, Encryption, Compression, XML, Socket, XMP, HTML to XML, JSON, JWT, OAuth1, conversion, PKCS12/PFX, Java Keystore, ASN.1, PEM, ECDSA, ...
Chilkat .NET Core Class Library
A simple caching library to cache any data structure for a specific amount of time in any .NET application. Additionally, offers simple HTTP methods for caching web request data. Powered by FileStore.
Restores Newtonsoft.JSON as the default serializer for RestSharp.
A C# Http Multipart/form-data parser that works correctly on binary data and very large files.
A native functional ASP.NET Core web framework for F# developers.
A library that adds the Json verb methods to the httpclient
A (very simple) HTTP server which you can use from within a testing environment or, if you're really ambitious, for some other reason.
Provides infrastructure for common error handling, tracing, configuration, and HTTP/REST-based pipeline manipulation for REST clients generated with Hyak.
This is the Flurl.Http package, repackaged with strongly named assemblies. See https://flurl.io/ for the official project.