in runner-plugin-sdk/src/main/java/org/apache/apisix/plugin/runner/HttpRequest.java [167:177]
public String getHeader(String headerName) {
Map<String, String> headers = getHeaders();
if (!CollectionUtils.isEmpty(headers)) {
for (Map.Entry<String, String> header : headers.entrySet()) {
if (header.getKey().equals(headerName)) {
return header.getValue();
}
}
}
return null;
}