HTTP Client

HTTP Request Example

Simple example to show how to make HTTP requests using a HTTP Client. full test.

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data class Book(val author: String, val title: String)

private val books: MutableMap<Int, Book> = linkedMapOf(
    100 to Book("Miguel de Cervantes", "Don Quixote"),
    101 to Book("William Shakespeare", "Hamlet"),
    102 to Book("Homer", "The Odyssey")
)

val server: Server = Server(adapter) {
    post("/books") {
        // Require fails if parameter does not exists
        val author = queryParameters.require("author")
        val title = queryParameters.require("title")
        val id = (books.keys.max() ?: 0) + 1
        books += id to Book(author, title)
        send(201, id)
    }

    get("/books/{id}") {
        val bookId = pathParameters.require("id").toInt()
        val book = books[bookId]
        if (book != null)
            // ok() is a shortcut to send(200)
            ok("Title: ${book.title}, Author: ${book.author}")
        else
            send(404, "Book not found")
    }

    put("/books/{id}") {
        val bookId = pathParameters.require("id").toInt()
        val book = books[bookId]
        if (book != null) {
            books += bookId to book.copy(
                author = queryParameters["author"] ?: book.author,
                title = queryParameters["title"] ?: book.title
            )

            ok("Book with id '$bookId' updated")
        }
        else {
            send(404, "Book not found")
        }
    }

    delete("/books/{id}") {
        val bookId = pathParameters.require("id").toInt()
        val book = books[bookId]
        books -= bookId
        if (book != null)
            ok("Book with id '$bookId' deleted")
        else
            send(404, "Book not found")
    }

    // Matches path's requests with *any* HTTP method as a fallback (return 404 instead 405)
    any("/books/{id}") { send(405) }

    get("/books") { ok(books.keys.joinToString(" ", transform = Int::toString)) }
}

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