JMeter interface test tool foundation - sampler (II)

6） Use keep Alive：
When this option is selected ,JMeter And the target server Keep-Alive In a way that HTTP signal communication , Selected by default .
HTTP In request Keep-Alive Mode description ：
If a browser has multiple requests for a domain name , There will be frequent connections and disconnections . therefore HTTP 1.0 In the Connection: keep-alive attribute , Used to establish long connections , That's what we're talking about Keep-Alive Pattern .
Keep-Alive Patterns are more efficient , Because it avoids the overhead of frequent connection establishment and release .

7） Yes POST Use multipart/form-data：
Use multipart/from-data or application/x-www-form-urlencoded Mode sending HTTP POST request , Not selected by default .
explain POST The encoding type of the request form submission ：
multipart/from-data or application/x-www-form-urlencoded It is used to control how to encode the form data before sending it to the server .

enctype attribute	explain
application/x-www-form-urlencoded	Default encoding , key1=value1&key2=value2.
multipart/form-data	Normal form submission , And form file upload .
text/plain	Coding in plain text , It doesn't contain any controls or format characters , This method is not commonly used .

8） Browser compatible header (Browser-compatible headers)
When you check multipart/form-data when , Check this box to cut off http In the request header Content-Type and Content-Transfer-Encoding, And just send Content-Disposition part .
Send the parameters with the request ：
1） Parameters (Parameters)：
Send... With parameters in the request URL ,JMeter Provides a simple way to parameterize . Users can URL All parameters in are set in this table , Each row in the table is a parameter value pair （ Corresponding RUL Medium name 1= value 1）.
Coding is the best option , Because if the parameter value contains ASCII Control Chars perhaps Non-ASCII characters Or other symbols , If not checked, the sending will fail （ The code problem ）, If checked, these special symbols will be coded automatically

2） Message body data (Body Data)：
Data messages sent with requests , Multiple data formats can be supported here json、xml etc. .
for example ：
Parameter format ：name=zhangsan&age=15 In the form of .（ Parameters are in plain text ）
Parameter format ：json form .( Need configuration http Header Manager , add to Context-Type = application/json)
Be careful ：Parameters and Body Data You can only send parameters in one of these ways .

3） Upload files (Files Upload)：
Send the file in the request . Usually HTTP File upload behavior can be simulated in this way , The parameter name is the parameter corresponding to the sending file ,MINE Type For resource media type .

（4） Advanced page options

According to the illustration above ：
Client implementation (Client implementation)：

• Realization ( Implementation)： send out http How to request . Options for Java and HttpClient4, The default is HttpClient4.
  HttpClient4 yes Java How the toolkit implements the request , Is based on .net Kit customization , Efficient .
  If you are uploading a file, you must choose , Otherwise, the request is sent successfully , In fact, the file was not uploaded successfully .
• Overtime （ millisecond ）<Timeouts(milliseconds)>： timeout .
  link (Connect)： Connection timeout , The unit is millisecond ;
  Respond to (Response)： Response wait timeout , The unit is millisecond ;

from HTML File embedded resources (Embedded Resources from HTML Files)：

• from HTML The file gets all the contained resources (Retrieve All Embedded Resources)：
  When this option is selected ,JMeter In a HTTP Requesting and receiving a response HTML After file contents , Also on the HTML To analyze , And get the HTML All the resources contained in （ picture 、flash etc. ）, Not selected by default .
  If the user only wants to get specific resources in the page , It can be in the back URLs must match The text box , Fill in the specific resource expression to download , So only those that match the specified regular expression URL The pointing resource will be downloaded .
• Parallel download (Parallel downloads)： Whether to use the self-defined resource pool , Check to set the size .
• Number (Number)： Resource pool size , The default setting is 6.
• The url must match (URLs must match)：URL Matching filter , Fill in this item and only the matching url Resources for .
  for example ： To get http://example.com/ All resources under , Using regular expressions http://example.com/.*.

source address :
Used only for http Agreement and Implementation by HttpClient4 The situation of , This property is used to enable IP cheating , Will rewrite this http The default local IP Address .
be used for JMeter The host has multiple IP Address . The value can be the host name 、IP Address or network interface device , Such as “ey0” or “l0” or “wlan0”.
You can set multiple , prevent IP The address is pulled black by the server .

• IP/ Host name (IP/Hostname)： Use specific IP Address or （ Local ） Host name .
• equipment (Device)： Select the first available address for the interface , The device can be IPv4 or IPv6.
• equipment IPV4： Select the name of the device IPv4 Address .
• equipment IPV6： Select the name of the device IPv6 Address .

proxy server :
I don't want to use the local address to send Http request , If you want to use a proxy server, fill in .

• Server name or IP： The name of the proxy server or IP Address .
• Port number ： The port number of the agent .
• user name ： Use the user name of the agent .
• password ： User password .

Save the response as MD5 Hash ： Select the , Only the server-side response data is recorded at execution time MD5 value , Without recording the complete response data . When a very large amount of data needs to be tested , It is recommended that this option be selected , To reduce the cost of sampler recording response data .
Come here “HTTP request ” This sampler is over , The page and usage of each sampler are not used , It can't be explained one by one here , What kind of sampler will be used in the future （Samplers） I'll explain it alone .

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