F5 web server device blocks Liferay URL with message: "Bad multipart parameters parsing / No boundary defined for multipart request"

Issue

• A F5 web server device (for example, a load balancer) blocks a Liferay URL with messages like:
  
  

  Bad multipart parameters parsing

  No boundary defined for multipart request

  Flagging the request to process the URL as a violation.

Environment

• Liferay DXP 7.0+

Resolution

• As Liferay Support is dedicated to assist with the basic out-of-the-box product rather than high-availability configurations, please, contact your relevant network/F5 administrator regarding this issue.
• See also:
  - Architectural Assistance
  - Third-Party Technology Defects, Optimizations and Configurations

Additional Information

• Bad multipart parameters parsing
  From F5 docs https://support.f5.com/csp/article/K10280:
  
  The system examines the requests to verify that the Content-Disposition header matches the format: name="param_key";\r\n.
  The system also checks that the following is true:
  
  
• A boundary follows immediately after the request headers.
• The parameter value matches the format: ‘name="param_key";\r\n.
• A chunked body contains at least one CRLF.
• A chunked body ends with CRLF.
  
  If one of these is false, a violation is issued.
  
  
• No boundary defined for multipart request
  From F5 docs https://support.f5.com/csp/article/K44162352:
  
  
• There is no boundary delimiter defined for the multipart request.