CORS error when sending events following the quick start guide

1

Following the quick start guide. Quick start guide | Snowplow Documentation

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2

I don’t think that is a CORS error - it is likely mixed content (as you are trying to send a request to a HTTP endpoint from a HTTPS webpage).

If you have a SSL certificate setup on your load balancer (recommended) then you can simply switch to https and that will resolve the mixed content issue.

3

Ah I didn’t set SSL certificate, just want to quickly setup a learning env.

Without a SSL, I can’t use this page to test sending a event, right?

In that case can I simply use a curl command to send a request? A sample request would be great.

Thanks for your response

4

Check out this page: Tracking your first events | Snowplow Documentation

Go to the “community” tab, which states:

If you have not yet configured an SSL certificate and a custom domain name for your Collector, you can use http://<collector_dns_name> (http , not https ), where collector_dns_name is the output of the pipeline Terraform module.

5

Yeah I’m using http, see the screenshot. What else could cause the issue?

6

Ah just noticed, why on the left it’s http but in right side chrome inspector it’s https?

7

Correct - your browser won’t allow the mixed content request.

The easiest way around it (given you’ve got devtools open) is to right click on the request and copy it as cURL - and just switch the protocol to HTTP. This should give you something like

curl 'http://test/i?e=pv&aid=test'

Chrome might give you some headers as well but these aren’t really necessary.

8

Thanks Mike! I copied as curl from curl as well but found there’s no body in the request.
like this:

curl 'http://test/i?e=pv&aid=test'

could you provide a sample query including a post body?

9

Sure - here’s another example from the page of a self describing event using the POST endpoint.

curl 'https://HOST/com.snowplowanalytics.snowplow/tp2' \
  -H 'content-type: application/json; charset=UTF-8' \
  -H 'cookie: sp=d5efb628-d401-405a-8d3b-226fc7f88123; _sp_id.1251=38b1046d-9028-4f0d-8502-c41ed0918929.1715818568.1.1722249470.1721870882.df8f4c35-69ef-47e9-8a39-0dfb912f47fc' \
  --data-raw '{"schema":"iglu:com.snowplowanalytics.snowplow/payload_data/jsonschema/1-0-4","data":[{"e":"ue","eid":"2bc12a32-62de-485c-9e06-7eff597af359","tv":"js-3.13.1","tna":"sp1","aid":"test","p":"web","cookie":"1","cs":"UTF-8","lang":"en-GB","res":"3840x1600","cd":"24","tz":"Location/Location","dtm":"1723777346860","vp":"0x0","ds":"0x0","vid":"16","sid":"0ea2a0dc-3e4e-47a5-b5bc-99c16e6798fb","duid":"41c4c8eb-b823-4fc6-a976-2ac1b7c5256d","url":"about:srcdoc","ue_px":"eyJzY2hlbWEiOiJpZ2x1OmNvbS5zbm93cGxvd2FuYWx5dGljcy5zbm93cGxvdy91bnN0cnVjdF9ldmVudC9qc29uc2NoZW1hLzEtMC0wIiwiZGF0YSI6eyJzY2hlbWEiOiJpZ2x1OmNvbS5zbm93cGxvd2FuYWx5dGljcy5zbm93cGxvdy9hZGRfdG9fY2FydC9qc29uc2NoZW1hLzEtMC0wIiwiZGF0YSI6eyJza3UiOiJBU08wMTA0MyIsInVuaXRQcmljZSI6NDkuOTUsInF1YW50aXR5IjoxMDAwfX19","cx":"eyJzY2hlbWEiOiJpZ2x1OmNvbS5zbm93cGxvd2FuYWx5dGljcy5zbm93cGxvdy9jb250ZXh0cy9qc29uc2NoZW1hLzEtMC0wIiwiZGF0YSI6W3sic2NoZW1hIjoiaWdsdTpjb20uc25vd3Bsb3dhbmFseXRpY3Muc25vd3Bsb3cvd2ViX3BhZ2UvanNvbnNjaGVtYS8xLTAtMCIsImRhdGEiOnsiaWQiOiI4NzFjYzg0MS05NGFjLTRjMTQtYmY2OS1kN2IwYWQyYWFkYzcifX1dfQ","stm":"1723777346861"}]}'