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Send HTTP Requests

Sending an HTTP request to an external service is a common CI/CD task. In Automation, this task can be generally solved as follows:

  1. Reference a Maven library that provides an HTTP client of your choice (the library must be hosted on Maven Central).

  2. Use the client to send requests in a kotlinScript code block.

For example, the following script gets a random joke from and prints it to the job's log. In this example we use the OkHttp client.

@file:DependsOn("com.squareup.okhttp:okhttp:2.7.4", "org.json:json:20200518") import com.squareup.okhttp.* import org.json.JSONObject job("Example") { container(image = "openjdk:11", displayName = "Get random joke") { kotlinScript { val client = OkHttpClient() val request = Request.Builder() .url("") .addHeader("Accept", "application/json") .build() val response = client.newCall(request).execute() val jData = response.body().string() val jObject = JSONObject(jData) val joke = jObject.get("joke").toString() println(joke) } } }

More complex example: A build script generates a log file with the time log-message data. The task is to send this log to an external service in the JSON format. The service requires authentication with a permanent token. The token is stored in the project's Secrets & Parameters. In this example we use the Ktor HTTP client.

@file:DependsOn("io.ktor:ktor-client-core:1.6.0", "io.ktor:ktor-client-gson:1.6.0") import io.ktor.client.* import io.ktor.client.request.* import io.ktor.http.* job("Example") { container(image = "openjdk:11", displayName = "Send JSON logs"){ // get auth token from a project secret env["TOKEN"] = Secrets("auth-token") kotlinScript { // emulate the work of build script by creating a log file val file ="logs.txt") file.writeText(""" 12:00:01 Log message 1 12:00:02 Log message 2 12:00:02 Log message 3 """.trimIndent()) // convert file to object list val log = readLogFile(file) // create a Ktor HTTP client val client = HttpClient() { // install JsonFeature to serialize the data we send install(io.ktor.client.features.json.JsonFeature) { // use the Gson serializer serializer = io.ktor.client.features.json.GsonSerializer() } } // get auth token from env var val token = System.getenv("TOKEN") // send a POST request to external service<Unit>("https://external-service.url") { headers { // add auth header with bearer token append(HttpHeaders.Authorization, "Bearer $token") } // the client will serialize log into json contentType(ContentType.Application.Json) body = log } } } // external service receives the payload: // [{"time":"12:00:01","msg":"Log message 1"}, // {"time":"12:00:02","msg":"Log message 2"}, // {"time":"12:00:02","msg":"Log message 3"}] } // representation of a log line data class LogEntry(val time: String, val msg: String) fun readLogFile(file: List<LogEntry> { val logLines = file.readLines() val result = mutableListOf<LogEntry>() logLines.forEach { val line = it.split(" ", limit = 2) val entry = LogEntry(line[0], line[1]) result.add(entry) } return result }
Last modified: 30 June 2021