assetPrefix not applied to all _next/static files in standalone mode

[kkanyingi]

Summary

I'm building a standalone app deployed via a Docker image to various environments. The Docker image is built using a Jenkins pipeline, which doesn't handle environment-specific variables.

At build time, the next.config.js file is serialised into a server.js file and also copied into required-server-files.json. However, this hardcodes certain configurations, including assetPrefix, making it environment-agnostic. To address this, I created a script that modifies server.js and required-server-files.json using sed to set the correct assetPrefix for each environment before starting the server.

The problem: In my CI environment, some _next/static files load with the correct assetPrefix, but others are missing it, resulting in 404 errors.

Has anyone encountered this issue or found a reliable solution?

Additional information

# This is my `docker/start.sh` script

SERVER_JS_SCRIPT="server.js"
REQUIRED_SERVER_FILES=".next/required-server-files.json"

if [ ! -f $SERVER_JS_SCRIPT ]; then
    export $(grep -v '^#' .env)
    
    echo "server.js not found, running nextjs from standalone output"
    SERVER_JS_SCRIPT="./.next/standalone/server.js"
    REQUIRED_SERVER_FILES="./.next/standalone/.next/required-server-files.json"
fi 

# Replace assetPrefix in server.js and required-server-files.json
ASSETS_PREFIX_SEARCH='"assetPrefix":""'
ASSETS_PREFIX_REPLACE="\"assetPrefix\":\"$NEXT_PUBLIC_BASE_PATH\""

echo "replacing assetPrefix with $ASSETS_PREFIX_REPLACE..."

sed -i -e "s;$ASSETS_PREFIX_SEARCH;$ASSETS_PREFIX_REPLACE;" $SERVER_JS_SCRIPT
sed -i -e "s;$ASSETS_PREFIX_SEARCH;$ASSETS_PREFIX_REPLACE;" $REQUIRED_SERVER_FILES


PORT=$NEXT_PUBLIC_NODE_PORT HOSTNAME=$LOCAL_ADDRESS node $SERVER_JS_SCRIPT