getResponseHeaders（）函数将响应头作为一个String返回，所以如果你想得到单独的头，你需要先用行分隔符分割，然后用冒号分割以得到名称/值对。
示例代码：

def headers = prev.getResponseHeaders().split('\n').inject([:]) { out, header ->
    if (header.contains(':')) {
        header.split(':').with {
            out[it[0].trim()] = it[1].trim()
        }
    }
    out
}

headers.each { header ->
    if (header.getKey() == 'transactionRef') {
        log.info('Required header value: ' + header.getValue())
    }
}

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有关JMeter中Groovy脚本的更多信息：Apache Groovy - Why and How You Should Use It的
P.S.使用正则表达式提取器不是更容易吗？相关配置将类似于：
x1c 0d1x的数据

以下是添加基于JSR223的响应头Assert的步骤：
1.在采样器上添加JSR223 Assertion
1.确保语言是groovy的，因为我们将使用groovy
1.将以下脚本添加到JSR223脚本中：

import java.util.HashMap;

def sanitizeResponseHaders() {
    def headers = new HashMap<String, String>();
    if(SampleResult.getHeadersSize() > 0) {
        def headersData = SampleResult.getResponseHeaders().split("\n");
        for(headerData: headersData) {
            if(headerData.contains(":")) {
                def header = headerData.split(":");
                headers.put(header[0].toLowerCase().trim(), header[1].toLowerCase().trim());        
            }
        }
    }
    return headers;
}

def assertHeader(headers, header, value) {
    if(!headers.get(header).equals(value)) {
        def msg = "Header assertion failed: " + header + " is not as expected " + value + " and actual value is " + headers.get(header);
         SampleResult.setSuccessful(false);
         SampleResult.setResponseMessage(msg);
        AssertionResult.setFailure(true);
        AssertionResult.setFailureMessage(msg);
        addLog(msg);    
    }
}

def addLog(msg) {
   log.info(msg);
}

def logHeaders(headers) {
    for(entry: headers.entrySet()) {
       addLog("header name: " + entry.getKey() + ", value: " + entry.getValue());   
    }
}

addLog("=========== Header assertion started ===============");
def headers = sanitizeResponseHaders();

//Add your own header assertion here
assertHeader(headers, "x-frame-options", "sameorigin");

logHeaders(headers);
addLog("============ Header assertion completed =============");

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1.在Add your own header assertion here行，添加您自己的Assert。为此，只需为每个Assert调用assertHeader(headers, "your_own_header", "your_own_header_value");方法。