ReadyAPI "java.lang.OutOfMemoryError"

UPDATE: I was able to get ReadyAPI to complete for a large API Request on one of our instances. The bottom line is, when working with huge data responses from an API request in ReadyAPI, you need to manage memory efficiently and avoid loading the entire response into memory if possible. ReadyAPI’s standard test steps (like REST or SOAP Request) will load the full response into memory and that's where I was getting errors.  However, you can use Groovy scripting to process the response in chunks or stream it for large payloads.  

To run an API request directly from a Groovy script and process streaming chunks of data, I found this script:

import java.net.HttpURLConnection
import java.net.URL
import java.util.Arrays

//def apiUrl = 'https://your.api.endpoint/large-data'
def apiUrl = 'https://misp.cso.att.com//events/view/1003349'  //Prod
def connection = (HttpURLConnection) new URL(apiUrl).openConnection()
//connection.setRequestMethod('GET')
connection.setRequestProperty('Authorization', '<MISP Key>') //Test
connection.setRequestProperty('Content-Type', 'application/json')
connection.setRequestProperty('Accept', 'application/json')

def bufferSize = 1 * 1024 * 1024 // 1 MB
def buffer = new byte[bufferSize]
def inputStream = connection.getInputStream()
def bytesRead
def chunkIndex = 0

try {
    while ((bytesRead = inputStream.read(buffer)) != -1) {
        // Use Arrays.copyOfRange for an actual byte[]
        def chunk = (bytesRead == bufferSize) ? buffer : Arrays.copyOfRange(buffer, 0, bytesRead)
        def chunkString = new String(chunk, 'UTF-8')
        log.info "Chunk #${chunkIndex} (${bytesRead} bytes):\n${chunkString}\n"
        chunkIndex++
    }
} finally {
    inputStream.close()
    connection.disconnect()
    log.info "Finished streaming and printing data in chunks."
}

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