Random hangs on Akamai-fronted websites

[JustAnotherArchivist]

Since sometime recently, various websites frequently cause 6-hour stalls. It's unclear when this started exactly, but it became very noticeable (i.e. multiple jobs hanging every few hours) in October, I think. They have in common that they're all fronted by Akamai's CDN, i.e. they're all CNAME something.edgekey.net.. Some examples:

• www.ea.com, help.ea.com, and more (including outside of ea.com itself)
• www.adobe.com
• www.microsoft.com
• www.amd.com, support.amd.com
• olympics.com
• investors.biontech.de
• media.ford.com
• www.health.gov.au
• www.nokia.com
• www.tesla.com
• ir.gitlab.com
• investors.bentley.com
• www.climateactive.org.au
• www.ups.com
• www.businesswire.com

Not all requests on all Akamai-using websites or even all of these listed domains are stalling. Sometimes, connections time out after a long time (15-20 minutes) instead. There may be some relation to the request headers; in one case (investors.biontech.de), it appeared that not including a Connection header would cause the stalls when using HTTP/1.1, but that may not be the whole explanation.