This took me a while to figure out, so I wanted to share it:
Requirement: before reaching the application, Apache should rewrite a
header like:
MSISDN: 192.168.0.1 639285020062
to:
XX-MSISDN: 639285020062
Solution:
# Request headers
<IfModule !mod_headers.c>
LoadModule headers_module modules/mod_headers.so
</IfModule>
# Copy the MSISDN to an internal variable
RewriteEngine On
RewriteCond %{HTTP:MSISDN} .*\s(.*)
RewriteRule .* - [E=MSISDN:%1]
# Set the XX-MSISDN header
RequestHeader set XX-MSISDN %{MSISDN}e
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