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HTTP/2 and Fiori
Sascha Wenninger
@sufw
NET52433 @ TechEd 2017

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@sufw
What?
Next version of HTTP Protocol
Based on Google’s SPDY
Designed to ‘fix’ many annoying aspects of HTTP

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@sufw
Why?
• Binary
• Multiplexing
• Header Compression
• Encryption
Image credit: Nick Yang

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@sufw
Multiplexing - Benefits
With HTTP/1.1, browsers open 4-8 TCP connections per origin
For each connection:
• TCP Handshake (2 Round-Trips)
• TLS Handshake (2+ Round Trips)
• TCP Slow Start
HTTP/2 Multiplexing avoids this!
1 TCP Connection for everything
Application  HTTP
Presentation  TLS
Session
Transport  TCP
Network  IP
Data Link
Physical

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@sufw
Can I use it? – Browser
• IE 6 = WTF?
• IE 7 = LOL
• IE 8 = No
• IE 11 = Kind of
• Anything* else = Yes!
*yes even Edge!

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@sufw
Can I use it? – Server
• SAP WebDispatcher/ICM kernel >= 7.49
• Proper SSL setup

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@sufw
Set it up!
1. icm/HTTP/support_http2=true
2. Restart ICM
See Nick Yang’s blog post
SAP Web Dispatcher
ABAP System Java System
ICM
HANA DB
ICM
HANA DB
HTTP/2
HTTP/1.1

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@sufw
Set it up!
1. icm/HTTP/support_http2=true
2. Restart ICM
Bonus points for Web Dispatcher:
wdisp/support_http2_to_backend=true
See Nick Yang’s blog post
SAP Web Dispatcher
ABAP System Java System
ICM
HANA DB
ICM
HANA DB
HTTP/2
HTTP/2

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@sufw
Isn’t TLS Slow?

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@sufw
Isn’t TLS Slow?
No.

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@sufw
Isn’t TLS Slow?
No.
Not even on an SAP ICM, on ~2011 era hardware!
3%
Throughput Response Time (ms)
Requests/s* Median 99th percentile
HTTP 93 20 33
HTTPS 93 36 40 4%
*Designed for 100/s, so my PC wasn’t fast enough.
New TLS Handshake for each connection
7%

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@sufw
Let’s Test!
My role-based Fiori Launchpad
UI5 1.44
~180ms to server
30Mbps WAN link
Chrome
Empty cache
n=10
Time to Load event

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@sufw
TCP Connections
See chrome://net-internals/#sockets
Requests TCP Handshakes TLS Handshakes
HTTP/1.1 68 7 7
HTTP/2 68 1 1

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@sufw
Profit!
0
1
2
3
4
5
0 2 4 6 8 10 12 14 16 18 20 22 24
Frequency
Load Time
Fiori Launchpad: Time to 'Load' event
That’s the median, obviously
-20%
18s
14s

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@sufw

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@sufw
Fiori CDN
• Often A Good Idea, but depends on network topology
• Where are your users? Is Akamai really “closer”?
• Do you have Riverbed WAN Acceleration?
• Is your internet link congested?
• Is your proxy slow?
• Individual results may vary
• Does not currently support HTTP/2, even though Akamai does 

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@sufw

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@sufw

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@sufw
Profit!
0
1
2
3
4
5
0 2 4 6 8 10 12 14 16 18 20 22 24
Frequency
Load Time
Fiori Launchpad: Time to 'Load' event
-20%
18s
14s
-20%
11s

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@sufw

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@sufw
Further Reading
• The HTTP/2 “Home Page”
• The HTTP/2 RFC
• SAP Help on HTTP/2
• Nick Yang’s blog post about HTTP/2
• Set up Fiori CDN
• Improving Fiori Performance
• Is TLS Fast Yet?
• My blog post on TLS performance
• Browser support for HTTP/2

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@sufw
Thank you!
Sascha Wenninger
sascha@BlueT.com.sg
@sufw
+65 8799 1446
https://www.slideshare.net/sufw/http2-and-sap-fiori