2022 the most complete and detailed JMeter interface test tutorial and detailed interface test process in the whole network - JMeter test plan component (thread ＜ user ＞)

（1） Introduction of sampler
The sampler is used to simulate user operation , Send the request to the server and receive the response data from the server .
Samplers are components within thread groups , In other words, samplers can only be added to thread groups .
Sampler (Sampler) Send request to server in performance test , Record response information , The smallest unit that records the response time .（ The sampler usually performs three tasks ）
（2）JMeter Self contained sampler

• HTTP Request：HTTP request
• Flow Control Action ： Test activities
• Debug Sampler ：Debug Sampler
• JSR223 Sampler ：JSR223 Sampler
• AJP/1.3 Sampler ：AJP/1.3 Sampler
• Access Log Sampler：Access Log Sampler
• Bean Shell Sampler ：Bean Shell Sampler
• FTP Request ：FTP request
• JDBC Request ：JDBC Request
• JMS Publisher：JMS Release
• JMS Point-to-Point ：JMS Point to point
• JMS Subscriber ：JMS subscribe
• JUnit Request ：JUnit request
• Java Request ：Java request
• LDAP Extended Request ：LDAP Extension request default
• LDAP Request ：LDAP request
• OS Process Sampler ：OS Process sampler
• SMTP Sampler ：SMTP Sampler
• TCP Sampler ：TCP Sampler
• Mail Reader Sampler： Email reader sampler

explain ：

• The most commonly used in testing is probably “HTTP request ”.
• Every different type of sampler Different types of requests can be made to the server according to the set parameters .
• stay JMeter All of the Sampler in ,Java Request Sampler And Bean Shell Sampler It's two special customizable Sampler.

summary ：

• The role of the sampler is to send requests to the server , Record response information , Record the response time .
• Multiple samplers run in the order they appear in the tree .
  （3）“HTTP request ” Let's introduce the sampler as an example

According to the illustration above ：
HTTP Request：

• name (Name)： Sampler name , That is, the name of the interface to be accessed .
  It is suggested to write the address of the request interface , for example ：/login So when there are multiple samplers , The list on the left shows which interface the sampler is for .
• notes (Comments)： An explanation of the current sampler .

Web The server ：

• agreement <Protocol(http)>： Send to the target server HTTP Protocol at request time , It can be http Or is it https perhaps File , The default value is http agreement （ According to the demand ）.
• Server name or IP(Server Name or IP)：HTTP Request to send the domain name or IP Address , for example www.baidu.com perhaps 127.0.0.1.
• Port number (Port Number)： The port occupied by the application in the accessed server , Default 80 port .

HTTP request ：
1） Method (Method)：
send out HTTP How to request .（ It can be obtained from the interface document ）
The methods of request include ：GET、POST、HEAD、PUT、OPTIONS、TRACE、DELETE etc. .
2） route (Path)：
Target interface URL route （ Server address and port are not included ）.
You can also write the full path directly （ Configured above IP+ Ports can be omitted ） , No parameters api route .
3） Content encoding (Content encoding)：
The encoding of the request data content , The default value is iso8859 code , But not so content encoding Configure to UTF-8, To prevent Chinese garbled .
Explain Content encoding attribute ：
Accept-Encoding and Content-Encoding yes HTTP A pair of header fields used to agree on which encoding format to use to transmit the text .
Here's how it works :
1、 First browser （ That's the client side ） When sending a request , adopt Accept-Encoding Bring your own list of supported content encoding formats .
2、 The server receives the request , Choose one of them to encode the response information , And pass Content-Encoding To illustrate the coding information selected by the server .
3、 After the browser gets the response text , basis Content-Encoding unpack .

4） Automatic redirection ：
If this option is selected , When sending HTTP The response is 302/301 when ,JMeter Will automatically redirect to a new page , however JMeter Do not record the process content of redirection . It can only be used for GET and HEAD Method , If it is POST perhaps PUT The request is not sent by the sampler .
301、302 Response code description ：
The official explanation is more concise ：

• 301 redirect：301 Represents a permanent transfer (Permanently Moved)
• 302 redirect： 302 Represents a temporary transfer (Temporarily Moved )

In detail ,
What they have in common 301 and 302 Status codes all indicate redirection , That is to say, the browser will automatically jump to a new one after getting the status code returned by the server URL Address , This address can be answered from Location Get... In the first part （ The effect the user sees is the address he enters A In an instant, it becomes another address B）
The difference between them is .301 Old address A Has been permanently removed （ This resource is inaccessible ）, The search engine grabs the new content and exchanges the old URL with the redirected one ;302 Old address A Our resources are still there （ Still accessible ）, This redirect is only temporarily from the old address A Jump to address B, Search engines will grab new content and save old URLs .
summary ：
http Agreed 301 and 302 Status codes all represent redirection . The browser requests url When these two status codes are received , Will show and jump to Response Headers Medium Location. That is, input the address in the browser url A, But automatically jump to url B.

5） Follow the redirect ：
Http Request Default options for samplers , When the response code yes 3xx when , Automatically jump to the destination address . Unlike automatic redirection ,JMeter All request responses during redirection will be recorded , When viewing the result tree, you can see the content returned by the server , If there are multiple jumps, multiple requests will be recorded , This is the default option .
The difference between automatic redirection and follow-up redirection is only whether to record multiple jump requests .
stay JMeter Selected by default Follow the redirect , but Follow the redirect And Automatic redirection You can only choose one .

a key ： Supporting learning materials and video teaching

So here I have carefully prepared the detailed information of the above outline in The link below is as follows