Karate无文件POST多部分表单请求失效，求正确配置方法

问题场景 #

编写Karate Feature发送不含文件的POST multipart form请求时无法正常工作，怀疑字段为空。现有代码片段：

Given url apiurl
And multipart field RI = xmlRIString
And multipart field CI = xmlCIString
And multipart field BI = xmlBaseString

其中xmlRIString、xmlCIString、xmlBaseString均为XML字符串。

服务器可正常接收的Postman请求日志（脱敏）：

POST /submit HTTP/1.1
User-Agent: PostmanRuntime/7.22.0
Accept: */*
Cache-Control: no-cache
Postman-Token: ceac2d58-dd33-426b-bde5-26a0846d6385
Host: localhost:8001
Content-Type: multipart/form-data; boundary=--------------------------725566702214297796531881
Accept-Encoding: gzip, deflate, br
Cookie: some-cookie-value-here
Content-Length: 47864
Connection: keep-alive
----------------------------postman
Content-Disposition: form-data; name="RI"
 
<REQUEST_GROUP>some xml here</REQUEST_GROUP>
----------------------------postman
Content-Disposition: form-data; name="CI"
 
<REQUEST>some xml here</REQUEST>
----------------------------postman
Content-Disposition: form-data; name="BI"
 
<ABOUT_VERSIONS>some xml here</ABOUT_VERSIONS>
----------------------------postman--

可正常运行的curl命令：

curl --location --request POST 'http://localhost:8001/upload' \
--header 'Content-Type: multipart/form-data; boundary=--------------------------725566702214297796531881' \
--form 'RI=<REQUEST_GROUP>some xml here</REQUEST_GROUP>' \
--form 'CI=<REQUEST>some xml here</REQUEST>' \
--form 'BI=<ABOUT_VERSIONS>some xml here</ABOUT_VERSION>'

正确的Karate Feature实现 #

方式1：基础字符串字段提交 #

确保变量xmlRIString、xmlCIString、xmlBaseString已正确赋值且不为空，直接使用multipart field即可，Karate会自动处理multipart边界：

Given url 'http://localhost:8001/upload'
And multipart field RI = xmlRIString
And multipart field CI = xmlCIString
And multipart field BI = xmlBaseString
When method post
Then status 200

方式2：指定字段的Content-Type（可选） #

如果服务器要求XML字段的Content-Type为text/xml，可以为每个multipart字段添加header：

Given url 'http://localhost:8001/upload'
And multipart field RI = xmlRIString
And multipart header RI Content-Type = 'text/xml'
And multipart field CI = xmlCIString
And multipart header CI Content-Type = 'text/xml'
And multipart field BI = xmlBaseString
And multipart header BI Content-Type = 'text/xml'
When method post
Then status 200

关键验证步骤 #

• 确认变量值：在代码中添加日志输出，验证XML变量是否正确加载：

  * print "RI XML content:", xmlRIString
  

• 开启请求日志：在Karate配置中添加logPrettyRequest=true，可以查看实际发送的请求内容，确认multipart字段是否正确填充：

  Background:
    * configure logPrettyRequest = true
  

内容的提问来源于stack exchange，提问作者Evgeny Fedorenko