Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

What is HTTP Part IV - Clients, Servers, and Proxies. Oh My!

So far in this series, we have covered the basics of HTTP messaging, the underlying protocols, and last week, we focused on digging a little deeper into the terminology. This week we will focus on th...
Published Sep 29, 2017
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Christ Follower, Husband, Father, Technologist. I love community and I especially love THIS community. My background is networking, but I've dabbled in all the F5 iStuff, I'm a recovering Perl guy, and am very much a python enthusiast. Learning alongside all of you in this accelerating industry toward modern apps and architectures.
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JRahm
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Jan 22, 2018

That image is blurred on purpose to mask the lower layers. It's fully visible in part 2 of the series.

 

Yes, you are correct that host header is required in HTTP/1.1. Did I give the impression that it wasn't? I'd like to clarify that if so.