Gatling: How to display full HTTP response body in the console or print it into a file

Gatling: How to display full HTTP response body in the console or print it into a file

In Gatling, displaying the full HTTP response body in the console or saving it to a file requires handling the response appropriately within your simulation scripts. Here's how you can achieve this:

Displaying Full Response Body in Console

To print the full HTTP response body to the console during or after a simulation run, you can use Gatling's logging capabilities. By default, Gatling logs the request and response summary, but for detailed logging, you can customize it.

  1. Custom Logging Configuration: Gatling uses SLF4J for logging, and you can configure it to log HTTP response bodies explicitly.

    • Logback Configuration: Gatling uses Logback for logging configuration. You can create or modify a logback.xml or logback-test.xml file in your Gatling project's src/test/resources directory to customize logging.

    Here's an example of configuring Logback to log HTTP request and response bodies:

    <configuration> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>%date{HH:mm:ss.SSS} [%-5level] [%logger{36}] - %msg%n</pattern> </encoder> </appender> <logger name="io.gatling.http.ahc.HttpHandler" level="DEBUG" /> <root level="DEBUG"> <appender-ref ref="STDOUT" /> </root> </configuration>
    • In this configuration:
      • <logger name="io.gatling.http.ahc.HttpHandler" level="DEBUG" /> specifies that HTTP handler logs should be set to DEBUG level, which includes HTTP request and response bodies.

  2. Simulation Code: Ensure your Gatling simulation script captures the response body and logs it appropriately. Here's an example snippet:

    import io.gatling.core.Predef._ import io.gatling.http.Predef._ import scala.concurrent.duration._ class MySimulation extends Simulation { val httpConf = http.baseUrl("http://example.com") val scn = scenario("MyScenario") .exec(http("request") .get("/api/something") .check(status.is(200)) .check(bodyString.saveAs("responseBody")) // Save response body to session ) .exec(session => { println(session("responseBody").as[String]) // Print response body session }) setUp( scn.inject(atOnceUsers(1)) ).protocols(httpConf) }
    • .check(bodyString.saveAs("responseBody")) saves the response body to the Gatling session.
    • println(session("responseBody").as[String]) prints the response body to the console.

Saving Response Body to a File

If you want to save the response body to a file instead of printing it to the console:

  1. Modify the Gatling simulation script to write the response body to a file using standard Scala file I/O operations (java.nio.file).

  2. Example of saving the response body to a file:

    import java.nio.file.{Paths, Files} import java.nio.charset.StandardCharsets val scn = scenario("MyScenario") .exec(http("request") .get("/api/something") .check(status.is(200)) .check(bodyString.saveAs("responseBody")) // Save response body to session ) .exec(session => { val responseBody = session("responseBody").as[String] Files.write(Paths.get("response.txt"), responseBody.getBytes(StandardCharsets.UTF_8)) session })
    • Files.write(Paths.get("response.txt"), responseBody.getBytes(StandardCharsets.UTF_8)) writes the response body to a file named response.txt in the current directory.

Notes:

  • Ensure that logging configurations respect your organization's policies and security guidelines.
  • Customize file paths and names according to your needs.
  • Gatling's documentation and community forums are valuable resources for advanced customization and troubleshooting. Adjust the configurations and script snippets based on specific requirements and environment setups.

Examples

  1. Gatling print full HTTP response body to console

    • Description: How to log and display the full HTTP response body in the Gatling console output.
    • Example Code:
      val scn = scenario("ScenarioName") .exec(http("RequestName") .get("/api/endpoint") .check(bodyString.saveAs("responseBody"))) .exec { session => println(session("responseBody").as[String]) session }

  2. Gatling save HTTP response body to a file

    • Description: Saving the full HTTP response body into a file during Gatling script execution.
    • Example Code:
      val scn = scenario("ScenarioName") .exec(http("RequestName") .get("/api/endpoint") .check(bodyBytes.saveAs("responseBody"))) .exec { session => val responseBody = session("responseBody").as[Array[Byte]] new FileOutputStream("response.txt").write(responseBody) session }

  3. Gatling display full HTTP response body in logs

    • Description: Configuring Gatling to log and display the complete HTTP response body in its logs.
    • Example Code:
      val scn = scenario("ScenarioName") .exec(http("RequestName") .get("/api/endpoint") .check(bodyString.transform(s => { println(s) s })))

  4. Gatling log HTTP response body with headers

    • Description: Logging both HTTP response body and headers in Gatling for detailed request-response analysis.
    • Example Code:
      val scn = scenario("ScenarioName") .exec(http("RequestName") .get("/api/endpoint") .check(bodyString.saveAs("responseBody"))) .exec { session => val responseBody = session("responseBody").as[String] val headers = session("response").as[Response].headers println(s"Response Headers: $headers") println(s"Response Body: $responseBody") session }

  5. Gatling save full HTTP response body as variable

    • Description: Saving the entire HTTP response body as a variable in Gatling for further processing or validation.
    • Example Code:
      val scn = scenario("ScenarioName") .exec(http("RequestName") .get("/api/endpoint") .check(bodyString.saveAs("responseBody"))) .exec { session => val responseBody = session("responseBody").as[String] println(s"Response Body: $responseBody") session }

  6. Gatling extract and print HTTP response body

    • Description: Extracting and printing the full HTTP response body in Gatling for debugging purposes.
    • Example Code:
      val scn = scenario("ScenarioName") .exec(http("RequestName") .get("/api/endpoint") .check(bodyString.transform(s => { println(s"Response Body: $s") s })))

  7. Gatling print HTTP response body with status

    • Description: Printing the HTTP response body along with the status code in Gatling for comprehensive result analysis.
    • Example Code:
      val scn = scenario("ScenarioName") .exec(http("RequestName") .get("/api/endpoint") .check(status.is(200), bodyString.saveAs("responseBody"))) .exec { session => val responseBody = session("responseBody").as[String] println(s"Response Status: ${session("status").as[Int]}") println(s"Response Body: $responseBody") session }

  8. Gatling save HTTP response body to variable

    • Description: Saving the HTTP response body to a variable in Gatling for subsequent requests or validations.
    • Example Code:
      val scn = scenario("ScenarioName") .exec(http("RequestName") .get("/api/endpoint") .check(bodyString.saveAs("responseBody"))) .exec { session => val responseBody = session("responseBody").as[String] println(s"Response Body: $responseBody") session }

  9. Gatling display complete HTTP response in console

    • Description: Configuring Gatling to display the complete HTTP response (including headers and body) in the console output.
    • Example Code:
      val scn = scenario("ScenarioName") .exec(http("RequestName") .get("/api/endpoint") .check(bodyString.transform(s => { println(session("response").as[String]) s })))

  10. Gatling log HTTP response body to file

    • Description: Logging the entire HTTP response body to a file during Gatling script execution.
    • Example Code:
      val scn = scenario("ScenarioName") .exec(http("RequestName") .get("/api/endpoint") .check(bodyBytes.saveAs("responseBody"))) .exec { session => val responseBody = session("responseBody").as[Array[Byte]] val file = new java.io.File("response.txt") val fos = new java.io.FileOutputStream(file) fos.write(responseBody) fos.close() session }

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