最近经常接触有测试人员脚本在jmeter4.0运行失败，返回Response code: 400，HTTP返回400，官方解释是"Bad Request 客户端请求的语法错误，服务器无法理解"，在jmeter5.1执行正常，这里本文记录下解决方法
一、jmeter4.0执行结果如下
1. 请求如下![[外链图片转存失败(img-E2u0PrvU-1569117698158)(https://s1.51cto.com/images/blog/201909/16/6696cd635105ecc54668bd6343657231.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/20190922100222459.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NzA1MTM4,size_16,color_FFFFFF,t_70)
2. 响应数据如下![[外链图片转存失败(img-4iBEQKIA-1569117698160)(https://s1.51cto.com/images/blog/201909/16/0ca1a86ccc4210d1c00326eae4d10457.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/2019092210023312.png)
二、jmeter5.1执行结果如下
1. 请求Request Body![[外链图片转存失败(img-HaxliON1-1569117698162)(https://s1.51cto.com/images/blog/201909/16/32423c8c21c263d10b861ea32fcb2d7a.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/20190922100240863.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NzA1MTM4,size_16,color_FFFFFF,t_70)
2. 请求Request Headers![[外链图片转存失败(img-B3tqDA8p-1569117698164)(https://s1.51cto.com/images/blog/201909/16/ff22b5fa7b388a581521032bec3769e9.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/20190922100250672.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NzA1MTM4,size_16,color_FFFFFF,t_70)
3. 响应数据Response Body![[外链图片转存失败(img-lgSo08Po-1569117698165)(https://s1.51cto.com/images/blog/201909/16/701de5466a42c6b21896335cfdf40baf.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/20190922100259931.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NzA1MTM4,size_16,color_FFFFFF,t_70)
4. 响应数据Response headers![[外链图片转存失败(img-CjKgdQV3-1569117698167)(https://s1.51cto.com/images/blog/201909/16/3edb1fce24df9a562bde313769bc72bf.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/20190922100309731.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NzA1MTM4,size_16,color_FFFFFF,t_70)
5. 响应数据Response headers![[外链图片转存失败(img-0DG14E4Y-1569117698169)(https://s1.51cto.com/images/blog/201909/16/3edb1fce24df9a562bde313769bc72bf.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/20190922100318610.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NzA1MTM4,size_16,color_FFFFFF,t_70)
三、问题分析
1. 脚本如下，看脚本可以得出脚本没有申明HTTP信息头管理器，所以系统调用的默认请求表头![[外链图片转存失败(img-uNxVUgSH-1569117698170)(https://s1.51cto.com/images/blog/201909/16/5dcc09180cc5fc3a02b33519cbfcb0e0.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/20190922100329691.png)
2. 经过对比jmeter4.0和jmeter5.1请求表头差异，可以看出他们的请求默认表头不一样，Jmeter5.1 HTTP接口 默认Content-Type类型为text/plain; Jmeter4.0 HTTP接口默认Content-Type类型为application/x-www-form-urlencoded，由于性能测试脚本HTTP接口表头类型就是text/plain，所以执行成功![[外链图片转存失败(img-BIj7rphO-1569117698171)(https://s1.51cto.com/images/blog/201909/16/91d87a0da7396581693e4c6c967710ea.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/2019092210034298.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NzA1MTM4,size_16,color_FFFFFF,t_70)
3. 所以我们只需要在脚本中自己添加一个信息头管理器，然后申明为text/plain就行，右键测试计划》添加》配置元件》HTTP信息头管理器![[外链图片转存失败(img-3syw6BIS-1569117698172)(https://s1.51cto.com/images/blog/201909/16/6b6fbadfeb7c49fcdd66203e04513d77.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/20190922100349981.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NzA1MTM4,size_16,color_FFFFFF,t_70)
4. 在信息头管理器，添加Content-Type=text/plain![[外链图片转存失败(img-BS6eouMR-1569117698173)(https://s1.51cto.com/images/blog/201909/16/b934bc994a31f6e61d9e9d6638cfe1f5.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/2019092210035812.png)
5. 点击执行按钮，执行成功![[外链图片转存失败(img-VzKUTNBR-1569117698174)(https://s1.51cto.com/images/blog/201909/16/89d584da9fdcb36f09b9e2115512c917.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)]](https://img-blog.csdnimg.cn/2019092210040522.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NzA1MTM4,size_16,color_FFFFFF,t_70)
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