component/trafficserver: Make Via header Rapid.CDN specific

Rapid.CDN has strong requirements regarding Via header passing by, so strip
down unnecessary parts of the original implementation.

component/trafficserver/buildout.cfg

@@ -45,6 +45,7 @@ patch-options = -p1
 # (see https://github.com/apache/trafficserver/issues/8539 for the detail)
 patches =
   ${:_profile_base_location_}/trafficserver-9.1.1-TSHttpTxnCacheLookupStatusGet-fix.patch#d8ed3db3a48e97eb72aaaf7d7598a2d2
+  ${:_profile_base_location_}/trafficserver-9.1.1-via-string-rapid-cdn.patch#8c39243d7525222385d5964485734f99
 environment =
   PATH=${libtool:location}/bin:${make:location}/bin:${patch:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:%(PATH)s
   LDFLAGS =-L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib -L${tcl:location}/lib -Wl,-rpath=${tcl:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${luajit:location}/lib  -lm

component/trafficserver/trafficserver-9.1.1-via-string-rapid-cdn.patch

+diff -ur trafficserver-9.1.1.orig/proxy/http/HttpTransactHeaders.cc trafficserver-9.1.1/proxy/http/HttpTransactHeaders.cc
+--- trafficserver-9.1.1.orig/proxy/http/HttpTransactHeaders.cc	2022-02-09 12:21:56.591350540 +0100
++++ trafficserver-9.1.1/proxy/http/HttpTransactHeaders.cc	2022-03-07 13:02:31.503849619 +0100
+@@ -758,15 +758,6 @@
+     write_hdr_protocol_stack(via_string, via_limit - via_string, ProtocolStackDetail::Standard, proto_buf.data(), n_proto);
+   *via_string++ = ' ';
+ 
+-  via_string += nstrcpy(via_string, s->http_config_param->proxy_hostname);
+-
+-  *via_string++ = '[';
+-  memcpy(via_string, Machine::instance()->uuid.getString(), TS_UUID_STRING_LEN);
+-  via_string += TS_UUID_STRING_LEN;
+-  *via_string++ = ']';
+-  *via_string++ = ' ';
+-  *via_string++ = '(';
+-
+   memcpy(via_string, s->http_config_param->proxy_request_via_string, s->http_config_param->proxy_request_via_string_len);
+   via_string += s->http_config_param->proxy_request_via_string_len;
+ 
+@@ -793,7 +784,6 @@
+     }
+   }
+ 
+-  *via_string++ = ')';
+   *via_string   = 0;
+ 
+   ink_assert((size_t)(via_string - new_via_string) < (sizeof(new_via_string) - 1));
+@@ -848,10 +838,6 @@
+     write_hdr_protocol_stack(via_string, via_limit - via_string, ProtocolStackDetail::Standard, proto_buf.data(), n_proto);
+   *via_string++ = ' ';
+ 
+-  via_string += nstrcpy(via_string, s->http_config_param->proxy_hostname);
+-  *via_string++ = ' ';
+-  *via_string++ = '(';
+-
+   memcpy(via_string, s->http_config_param->proxy_response_via_string, s->http_config_param->proxy_response_via_string_len);
+   via_string += s->http_config_param->proxy_response_via_string_len;
+ 
+@@ -877,7 +863,6 @@
+     }
+   }
+ 
+-  *via_string++ = ')';
+   *via_string   = 0;
+ 
+   ink_assert((size_t)(via_string - new_via_string) < (sizeof(new_via_string) - 1));