public String get(final String url, final Map<String, String> header) throws IOException {
        Request.Builder builder = new Request.Builder().url(url).get();
        addHeader(builder, header);
        return reqString(builder.build());
    }
get request.

@param url    url
@param header header
@return String
@throws IOException IOException
shenyu-admin/src/main/java/org/apache/shenyu/admin/utils/HttpUtils.java