Potential causes for Chrome to send duplicate requests

In my nginx server logs, I have the following entries (IPs and paths altered for illustration purposes):

101.101.101.101 - - [15/Apr/2020:14:46:03 +0000] "GET /item/download-file/ready/5e971e290107e HTTP/2.0" 200 142940 "https://example.com/referer" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36"

101.101.101.101 - - [15/Apr/2020:14:46:04 +0000] "GET /item/download-file/ready/5e971e290107e HTTP/1.1" 200 5 "https://example.com/referer" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36"

An issue arises due to the link being for a non-idempotent resource (accessible only once), resulting in a client error.

The links are for file downloads accessed via JavaScript with window.location.href = "...". The response server headers contain Content-Disposition: attachment.

Is there a scenario where Chrome would send two requests in HTTP/2.0 initially followed by HTTP/1.1 shortly after? Perhaps caused by a browser extension?

It's worth noting that I am unable to replicate this behavior on any of my browsers.

Update 2:

This behavior is not exclusive to Chrome, as logs show instances in Edge 44. Additionally, subsequent requests in other cases of this issue remain in HTTP/2.0 instead of switching to HTTP/1.1.

Update:

A request was made for typical response headers:

cache-control: no-store, no-cache, must-revalidate
content-disposition: attachment; filename=sources.zip
content-length: 8597357
content-transfer-encoding: Binary
content-type: application/octet-stream
date: Wed, 15 Apr 2020 17:23:44 GMT
expires: Thu, 19 Nov 1981 08:52:00 GMT
pragma: no-cache
server: nginx/1.16.1
status: 200
javascriptgoogle-chromehttp

Answer №1

It's puzzling why there are numerous requests coming through (potentially due to HTTP 2/1.1 negotiation), but the key solution lies in ensuring that the GET request is made safe and idempotent, while prompting the client to send a separate DELETE request. I understand that this may not be the preferred answer.

In cases where an unsafe/non-idempotent GET request is made, it leaves room for issues if the client sends multiple requests or if an indexing "spider" or pre-fetch cache crawls your site and hits every GET endpoint available. Refer to https://www.rfc-editor.org/rfc/rfc7231#section-8.1.3 for a breakdown of which HTTP methods should be safe and idempotent.

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