command-line options.
-WHAT'S NEW in version 2.4.0 (2014-03-??)
+WHAT'S NEW in version 2.5.0 (2014-03-??)
+
+ Add option --set-header=header:value to set header's value (only at the top
+level).
+
+ Add option --set-param=header:param=value to set header parameter's value
+(only at the top level). The header must exist.
+
+WHAT'S NEW in version 2.4.0 (2014-03-08)
Change option -d to accept a comma-separated list of headers:
-d h1,h2,h3,...