https://blog.csdn.net/Otldan/article/details/73864774
原文没有做encode，在value里面没有需要encode的时候是不会报错的，但如果有可能会出错
Request okHttpRequest;
if (MediaType.APPLICATION_FORM_URLENCODED_VALUE.equalsIgnoreCase(contentType)) {
String requestBodyString = request.keySet().stream()
.map(x -> x + "=" + java.net.URLEncoder.encode(request.get(x).toString()))
.collect(Collectors.joining("&"));
RequestBody rb = RequestBody.create(mediaType, requestBodyString);
okHttpRequest = new Request.Builder()
.url(url)
.headers(headers)
.method(method, rb)
.build();
