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   Recently, I often contact testers. The script fails to run in jmeter 4.0, returning Response code: 400, HTTP returns 400, the official explanation is "Bad Request client request syntax error, the server cannot understand", and the execution is normal in jmeter 5.1. Here, this article records the solution.

JMeter4.0 is executed as follows:

Request as follows

The response data is as follows

The results of jmeter 5.1 are as follows

Request Body Request

Request Headers

Response data Response Body

Response headers

Response headers

III. Problem analysis

The script is as follows. Looking at the script, you can get that the script does not declare the HTTP header manager, so the default request header of the system call

By comparing the request header differences between jmeter 4.0 and jmeter 5.1, we can see that their request headers are different by default. The default Content-Type of the HTTP interface of jmeter 5.1 is text/plain; the default Content-Type of the HTTP interface of jmeter 4.0 is application/x-www-form-urlencoded. Since the header type of the HTTP interface of the performance test script is text/plain, the execution is successful.

So we just need to add a header manager in the script ourselves, and then declare it as text/plain, right click on the test plan "Add" Configuration element "HTTP header manager

In the header manager, add Content-Type=text/plain

Click the execute button and execute successfully.

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