ajax请求中contentType与dataType区别

参考：

1) HttpRequest中常见的四种ContentType:

https://www.cnblogs.com/htoooth/p/7242217.html

https://www.cnblogs.com/hejingjing/p/6956906.html

https://www.cnblogs.com/xiaozong/p/5732332.html

2) Http中Content-Type的详解:

https://blog.csdn.net/danielzhou888/article/details/72861097

3) 常用HTTP contentType与后端处理方式

https://www.jianshu.com/p/dc6873d5fa3d

https://www.jianshu.com/p/dc6873d5fa3d

4)
AJAX对于JAVA接收HttpServletRequest和json字符串两种方式的传递写法

https://blog.csdn.net/wohaqiyi/article/details/79284106

5) ContentType

https://blog.csdn.net/u013789656/article/details/80927900

6) content-type的作用以及类型

https://blog.csdn.net/hw_hi/article/details/78529040

7) ajax请求中contentType与dataType区别

https://blog.csdn.net/john1337/article/details/60867183

8) HTTP Content-type 对照表 | content type

https://www.sojson.com/httpcontent.html

9) 对比获取文件Content-Type的四种方法

https://cloud.tencent.com/developer/article/1336314

10) JSP内置对象：设置content-type属性

https://www.2cto.com/kf/201707/656843.html