Unable to download files bigger than 1GB: "upstream prematurely closed connection while reading upstream"

Issue

• You can not download big files from the Liferay DXP, in general you can have problems with files bigger than 1 GB, as commonly are some LAR files.
• There is an error in the webserver service's log file similar to:
  

  [error] 75#75: *344298 upstream prematurely closed connection while reading upstream, client: 95.169.229.129, server: , request: "GET /documents/portlet_file_entry/20124/P%C3%A0gines_p%C3%BAbliques_2-20210210061050249.lar/b900a824-f425-16b2-92da-3c1dfa65038e?download=true HTTP/1.1", upstream: "http://127.0.0.1:81/documents/portlet_file_entry/20124/

Resolution

• By default, the WebServer service has enabled the buffering of responses from the proxied server using a temporary file that it has a 1024 M max size
• You can increase that limit or disable the buffering since the liferaycloud/nginx:1.16.1-4.0.3 by adding the LCP_WEBSERVER_PROXY_MAX_TEMP_FILE_SIZE environment variable to the service.
• The values are in megabytes, the default value is 1024, and 0 can be used for disabling the buffering.
• Eg. Check the image version of the webserver/LCP.json and set the environment variable:

  ...
  "env": {
   "LCP_WEBSERVER_PROXY_MAX_TEMP_FILE_SIZE": "0"
  }
  ...

 

Additional Information

• Defining environment variables in DXP Cloud services
• NGINX documentation for proxy_max_temp_file_size