Why I can't read text from URL with KTOR client?-CodePudding

I want to read a text from a URL with KTOR client.

suspend fun fetch() : String {
    val client = HttpClient(CIO)
    return client.get(ENDPOINT)
}

but it gives me a Type mismatch. Required:String. Found:HttpResponse.

I did the same thing with:

suspend fun fetch() : String {
    return URL(ENDPOINT).readText()
}

how can do it with KTOR client?

CodePudding user response：

See the doc on receiving responses.

Since Ktor 2, client.get(...) returns an HttpResponse instance, and then you can read the body explicitly using .body():

suspend fun fetch() : String {
    val client = HttpClient(CIO)
    return client.get(ENDPOINT).body()
}

The body() method is generic and the return type depends on the expected expression type. You can make it explicit by using .body<String>(), especially in contexts where the compiler cannot guess.

Note that you shouldn't create a new client on the fly every time you make a request. Clients need resources like thread pools, and it's best if they are reused.

CodePudding user response：

You can use the "receive" function in Ktor to retrieve the text content of a URL.

 suspend fun fetch(): String {
        val client = HttpClient(CIO)
        val response = client.get<HttpResponse>(ENDPOINT)
        return response.receive<String>()
    }