Returning a 429 without a net::err_failed

I have some code in my haproxy.cfg file that rate limits requests and returns a 429 and it works beautifully. However, it returns a net::ERR_FAILED and skips past some error handling code I have on the front end. I’ve tried to update the haproxy.cfg to send a status with a content type of “text/plain” so I can handle the status code and let the user know what’s going on, but I’m still getting the net::ERR_FAILED. My update code is as follows:

frontend s4p
    bind 192.168.250.146:80
    stick-table  type binary  len 20  size 100k  expire 10s  store http_req_rate(10s)

    # Track client by base32+src (Host header + URL path + src IP)
    http-request track-sc0 base32+src

    # Check map file to get rate limit for path
    http-request set-var(req.rate_limit)  path,map_beg(/etc/haproxy/rates.map,20)

    # Client's request rate is tracked
    http-request set-var(req.request_rate)  base32+src,table_http_req_rate()

    # Subtract the current request rate from the limit
    # If less than zero, set rate_abuse to true
    acl rate_abuse var(req.rate_limit),sub(req.request_rate) lt 0

    # Deny if rate abuse
    http-request return status 429 content-type "text/plain" if rate_abuse
    http-request lua.cors "*" "*" "*"
    http-response lua.cors
    default_backend api_servers

Can someone help me figure out how to send a response back to the client with a net::ERR_FAILED?

Thanks!

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