How to Send Byte Array in http request in Jmeter

Question

I`m using JMeter for load testing where I have to call the upload Image API through an HTTP request, and to achieve this I have to convert an image into a compressed byte array to send it out as post data through an HTTP request.

Can anyone show me how it would be possible through JMeter?

Your help would really be appreciated.

Answer 1

There are several options on how you can proceed:

1. You can use HTTP Raw Request Sampler (available through JMeter Plugins site) which gives you full control on what, how and where you send.

2. Have you tried enabling Use multipart/form-data for POST for HTTP Request Sampler? This is how files should be uploaded as per RFC-1867.

3. If your use case is specific and none of the above is applicable, you can always use JMeter Scripting extensions. For example if you add a Beanshell Pre Processor to your HTTP Request which performs file upload with something like:

   FileInputStream in = new FileInputStream("/home/glinius/401.png");
   ByteArrayOutputStream bos = new ByteArrayOutputStream();
   byte[] buffer = new byte[1024];
   for (int i; (i = in.read(buffer)) != -1; ) {
       bos.write(buffer, 0, i);
   }
   in.close();
   byte[] imageData = bos.toByteArray();
   bos.close();
   vars.put("imageData", new String(imageData));
   

You'll be able to add ${imageData} parameter in your POST request.