Simple HTTP server

In Get currency rates via HTTP we used only client, here we will host a server with GET and POST routes.
We will use same 2 libraries:

Model

We will use simple Person model with 2 fields

@Serializable
type Person name: String age: Int 

Get route

Let's declare path with ... path and method kind GET.
And just bind it to codeblock that will be executed.

path = "/hi" bind: Method.GET
route = path to: [
    response = Response status: Status.OK
    response body: "Hello, from niva okhttp server"
]

Post route

pathPost = "/person" bind: Method.POST
routePost = pathPost to: [
    person = Json::Person decode: it body strPayload 
    response = Response status: Status.OK
    response body: person toString
]

Everything is pretty similar here but we're also parse the person from strPayload of the body, and answer with its string representation.

Start

Collect all routes and start the server:

routes = Router routes: {route, routePost}
routes asServer: (SunHttp port: 9000) |> start

Checking

You can run
curl -v http://localhost:8080/hi
or

curl -X POST http://localhost:9000/person \                
                      -H "Content-Type: application/json" \
                      -d '{"name": "Alex", "age": 25}'

in your terminal to check that everything is working.

Or just check it from the code

client = JavaHttpClient new
// printing client prints everything from responce
printingClient::HttpHandler = PrintResponse new |> then: client

request = Request method: Method.GET uri: "http://localhost:9000"
responce = printingClient Request: request // send request, the client will print it

Put everything together

@Serializable
type Person name: String age: Int 

// curl -v http://localhost:8080/hi
path = "/hi" bind: Method.GET
route = path to: [
    response = Response status: Status.OK
    response body: "Hello, from niva server"
]

pathPost = "/person" bind: Method.POST
routePost = pathPost to: [
    person = Json::Person decode: it body strPayload 
    response = Response status: Status.OK
    response body: person toString
]
routes = Router routes: {route, routePost}
routes asServer: (SunHttp port: 9000) |> start

// one liner

One-liner

Router routes: {(
    "/example" bind: Method.GET |> 
               to: [ Response status: Status.OK |> 
                              body: "Hii! niva server"])} |>
    asServer: (SunHttp port: 9000) |> 
    start

Last modified: 14 December 2024