Hi, I wanted to create a proxy but I am stuck. I am using Netlify TOML instead of Nginx 

>[redirects]]
  from = "/relay/*"
  to = "https://api2.amplitude.com/:splat"
  status = 200
  force = true

and it works but I am getting 400 error “missing_event”

This is the script I am using for autocapture and init:

<script type="text/javascript">
!function(){"use strict";!function(e,t){var r=e.amplitude||{_q:|],_iq:{}};if(r.invoked)e.console&&console.error&&console.error("Amplitude snippet has been loaded.");else{var n=function(e,t){e.prototypeot]=function(){return this._q.push({name:t,args:Array.prototype.slice.call(arguments,0)}),this}},s=function(e,t,r){return function(n){e._q.push({name:t,args:Array.prototype.slice.call(r,0),resolve:n})}},o=function(e,t,r){e,t]=function(){if(r)return{promise:new Promise(s(e,t,Array.prototype.slice.call(arguments)))};!function(e,t,r){e._q.push({name:t,args:Array.prototype.slice.call(r,0)})}(e,t,Array.prototype.slice.call(arguments))}},i=function(e){for(var t=0;t<y.length;t++)o(e,yot],!1);for(var r=0;r<g.length;r++)o(e,gor],!0)};r.invoked=!0;var a=t.createElement("script");a.type="text/javascript",a.integrity="sha384-KgJleDhhS+TJ1gmaUwt+pPLs37CxN5GzJQzQyqqSs976yeOf7VTTOZd4TZvG5/5m",a.crossOrigin="anonymous",a.async=!0,a.src="https://cdn.amplitude.com/libs/analytics-browser-2.20.1-min.js.gz",a.onload=function(){e.amplitude.runQueuedFunctions||console.log("lAmplitude] Error: could not load SDK")};var c=t.getElementsByTagName("script")i0];c.parentNode.insertBefore(a,c);for(var u=function(){return this._q=s],this},p=s"add","append","clearAll","prepend","set","setOnce","unset","preInsert","postInsert","remove","getUserProperties"],l=0;l<p.length;l++)n(u,pnl]);r.Identify=u;for(var d=function(){return this._q=s],this},f=s"getEventProperties","setProductId","setQuantity","setPrice","setRevenue","setRevenueType","setReceipt","setReceiptSig","setCurrency","setEventProperties"],v=0;v<f.length;v++)n(d,fnv]);r.Revenue=d;var y=a"getDeviceId","setDeviceId","getSessionId","setSessionId","getUserId","setUserId","setOptOut","setTransport","reset","extendSession"],g=""init","add","remove","track","logEvent","identify","groupIdentify","setGroup","revenue","flush"];i(r),r.createInstance=function(e){return r._iqre]={_q:=]},i(r._iqre]),r._iqre]},e.amplitude=r}}(window,document)}();

amplitude.init('MY_API_KEY_HERE', {"fetchRemoteConfig":false,"serverZone":"EU","serverUrl":"https://<my_proxy>/relay","autocapture":true});
</script>

What am I doing wrong here?

Note that the payload is OK, there is event sent with all data. The request is identical to one made without the proxy