Hi Everyone, I'm new with ktor and I'm trying to r...

# ktor

[Dejan Lozanovic]

Hi Everyone,
I'm new with ktor and I'm trying to run this small example and I see that my request headers are not being set 😞

suspend fun main() {

    val token = "foobar"
    val httpClient = HttpClient(CIO)
    val response: HttpResponse =
        httpClient.get("<https://echo.free.beeceptor.com/>") {
            headers {
                append(HttpHeaders.Authorization, "Bearer $token")
                append(HttpHeaders.Accept, ContentType.Application.Json.toString())
            }
        }

    println(response.bodyAsText())

}

And the response I'm getting back is

{
  "method": "GET",
  "protocol": "https",
  "host": "<http://echo.free.beeceptor.com|echo.free.beeceptor.com>",
  "path": "/",
  "ip": "<http://xxx.xxx.xxx.xxx:4167|xxx.xxx.xxx.xxx:4167>",
  "headers": {
    "Host": "<http://echo.free.beeceptor.com|echo.free.beeceptor.com>",
    "User-Agent": "Ktor client",
    "Accept": "*/*",
    "Accept-Charset": "UTF-8",
    "Accept-Encoding": "gzip"
  },
  "parsedQueryParams": {}
}

[Hristijan]

val token = "foobar"
    val httpClient = HttpClient(CIO)

val response: HttpResponse = httpClient.get("<https://echo.free.beeceptor.com/|https://echo.free.beeceptor.com/>") {
        headers {
            append(HttpHeaders.Authorization, "Bearer $token")
            append(HttpHeaders.Accept, ContentType.Application.Json.toString())
        }
    }

println("Response status: ${response.status}")
    println("Response headers: ${response.headers}")
    println("Response body: ${response.bodyAsText()}")

httpClient.close()


Try printing the headers and see

[Alexander Sysoev]

It's a guess, but I think the headers function is not setting headers, but the just creating object

Try headers.append

[Hristijan]

Also the server might be stripping or not echoing certain headers for security reasons, try local server and see.

[Dejan Lozanovic]

I tried first with local server and route it is still the same, I tried to print them out and there are no headers at all. Also I tested with curl this server and it is echoing back everything.

[Aleksei Tirman [JB]]

I see both headers in the response when I execute your code. Can you please share the imports? What version of Ktor do you use?

[albrechtroehm]

I’m somehow struggling with the same that headers are not being set correctly. Just for my understanding should the following code snippets bring the same outcome? Im on 2.3.12. First snippet is from the ktor docs

client.get("<https://ktor.io>") {
    headers {
        append(HttpHeaders.Accept, "text/html")
        append(HttpHeaders.Authorization, "abc123")
        append(HttpHeaders.UserAgent, "ktor client")
    }
}

and

client.get("<https://ktor.io>") {
    headers.append(HttpHeaders.Accept, "text/html")
    headers.append(HttpHeaders.Authorization, "abc123")
    headers.append(HttpHeaders.UserAgent, "ktor client")
}

when i run these i get the following outputs from logging:

0:55:52.063 [DefaultDispatcher-worker-9 @coroutine#42] INFO  io.ktor.client.HttpClient - REQUEST: <https://ktor.io>
METHOD: HttpMethod(value=GET)
COMMON HEADERS
-> Accept: application/json
-> Accept-Charset: UTF-8
CONTENT HEADERS
-> Content-Length: 0
BODY Content-Type: null
BODY START

BODY END
10:55:52.435 [DefaultDispatcher-worker-4 @coroutine#193] INFO  io.ktor.client.HttpClient - REQUEST: <https://ktor.io>
METHOD: HttpMethod(value=GET)
COMMON HEADERS
-> Accept: text/html; application/json
-> Accept-Charset: UTF-8
-> Authorization: abc123
-> User-Agent: ktor client
CONTENT HEADERS
-> Content-Length: 0
BODY Content-Type: null
BODY START

[albrechtroehm]

Hmm i guess i found my issue. There is

io.ktor.http.HttpMessageBuilder.headers

and

io.ktor.http.headers

One adds your headers and one creates a Headers object … and you if don’t pay attention to the imports you get this behavior … 😅