Http Server in Swift

Here’s the translation of the HTTP Server example from Go to Swift, formatted in Markdown for Hugo:

Our first HTTP server example demonstrates how to create a basic server using the Foundation framework in Swift.

import Foundation

// A fundamental concept in HTTP servers is handlers. In Swift, we can use closures as handlers.
// This handler simply responds with "hello\n".
func hello(request: URLRequest) -> HTTPURLResponse {
    let response = HTTPURLResponse(url: request.url!, statusCode: 200, httpVersion: nil, headerFields: nil)!
    print("hello\n")
    return response
}

// This handler does something more sophisticated by reading all the HTTP request
// headers and echoing them into the response body.
func headers(request: URLRequest) -> HTTPURLResponse {
    var responseString = ""
    if let fields = request.allHTTPHeaderFields {
        for (name, value) in fields {
            responseString += "\(name): \(value)\n"
        }
    }
    let response = HTTPURLResponse(url: request.url!, statusCode: 200, httpVersion: nil, headerFields: nil)!
    print(responseString)
    return response
}

// Create a simple HTTP server
class HTTPServer {
    let port: UInt16
    
    init(port: UInt16) {
        self.port = port
    }
    
    func start() {
        let server = HTTPServer(port: 8090)
        print("Server listening on port \(server.port)")
        
        // In a real application, you would implement the server logic here
        // This is a simplified example and doesn't actually start a server
    }
}

// Set up routes
let routes = [
    "/hello": hello,
    "/headers": headers
]

// Start the server
let server = HTTPServer(port: 8090)
server.start()

// Keep the program running
RunLoop.main.run()

To run the server:

$ swift run
Server listening on port 8090

Note that this is a simplified example and doesn’t actually start a working HTTP server. In a real Swift application, you would typically use a framework like Vapor or Kitura for creating HTTP servers, as Swift’s standard library doesn’t include a built-in HTTP server.

For a more realistic server implementation, you might consider using a third-party framework. Here’s a basic example using Vapor:

import Vapor

let app = try Application(.detect())
defer { app.shutdown() }

app.get("hello") { req in
    return "hello\n"
}

app.get("headers") { req in
    return req.headers.description
}

try app.run()

This Vapor example provides similar functionality to the original code, with routes for “/hello” and “/headers”. To use this, you would need to set up a Vapor project and add the necessary dependencies.

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Http Server in Swift