Remove leading space in "Host: ..." headers for curl and HTTP

`curl` doesn't mind but `http` fails with:
    http: error: InvalidHeader: Invalid return character or leading space in header: Host
Removed spaces in both for consistency.

Author: alanconway

02-basics/bin/call.sh

@@ -3,4 +3,4 @@
 INGRESSGATEWAY=istio-ingressgateway
 IP_ADDRESS="$(minishift ip):$(kubectl get svc $INGRESSGATEWAY --namespace istio-system --output 'jsonpath={.spec.ports[?(@.port==80)].nodePort}')"
 
-curl -H "Host: greeter.knativetutorial.example.com" $IP_ADDRESS
+curl -H "Host:greeter.knativetutorial.example.com" $IP_ADDRESS

03-configs-and-routes/bin/call.sh

@@ -7,7 +7,7 @@ IP_ADDRESS="$(minishift ip):$(kubectl get svc $INGRESSGATEWAY --namespace istio-
 
 while true
 do
-  curl -H "Host: greeter.knativetutorial.example.com" $IP_ADDRESS 
+  curl -H "Host:greeter.knativetutorial.example.com" $IP_ADDRESS
   echo ""
   sleep .2
 done;

documentation/modules/ROOT/pages/02-basic-fundas.adoc

@@ -102,7 +102,7 @@ include::partial$knative-objects.adoc[tag=knative-configs]
 === routes
 include::partial$knative-objects.adoc[tag=knative-routes]
 
-When the service was invoked with `curl -H "Host: greeter.knativetutorial.example.com" $IP_ADDRESS`,you noticed that we added a **Host** header to the request with value `greeter.knativetutorial.example.com`,this FQDN is automatically assigned to your Knative service by the Knative Routes,it uses the format like `**<service-name>.<namespace>.<domain-suffix>**`.
+When the service was invoked with `curl -H "Host:greeter.knativetutorial.example.com" $IP_ADDRESS`,you noticed that we added a **Host** header to the request with value `greeter.knativetutorial.example.com`,this FQDN is automatically assigned to your Knative service by the Knative Routes,it uses the format like `**<service-name>.<namespace>.<domain-suffix>**`.
 
 [NOTE]
 ====

documentation/modules/ROOT/pages/03-configs-and-routes.adoc

@@ -134,7 +134,7 @@ include::partial$knative-objects.adoc[tag=knative-configs]
 === routes
 include::partial$knative-objects.adoc[tag=knative-routes]
 
-When the service is invoked with `curl -H "Host: greeter.knativetutorial.example.com" $IP_ADDRESS`, you noticed that we added a **Host** header to the `curl` command with the value `greeter.knativetutorial.example.com`. This FQDN is automatically assigned to your Knative service by the Knative route we created. It follows a format `<route-name>.<namespace>.<domain-suffix>`.
+When the service is invoked with `curl -H "Host:greeter.knativetutorial.example.com" $IP_ADDRESS`, you noticed that we added a **Host** header to the `curl` command with the value `greeter.knativetutorial.example.com`. This FQDN is automatically assigned to your Knative service by the Knative route we created. It follows a format `<route-name>.<namespace>.<domain-suffix>`.
 
 [NOTE]
 ====

documentation/modules/ROOT/pages/04-scaling.adoc

@@ -356,7 +356,7 @@ We will now send some load to the greeter service.  The command below sends 50 c
 [source,bash,subs="+macros,+attributes",linenums]
 ----
 siege -r 1 -c 50 -t 30S \
-  -H "Host: greeter.knativetutorial.example.com" \
+  -H "Host:greeter.knativetutorial.example.com" \
   "http://pass:[${IP_ADDRESS}]"
 ----
 

documentation/modules/ROOT/pages/05-build/build-templates.adoc

@@ -209,7 +209,7 @@ include::ROOT:partial$invoke-service.adoc[tag=env]
 
 [source,bash,subs="+macros,+attributes",linenums]
 ----
-curl -H "Host: event-greeter.knativetutorial.example.com" $IP_ADDRESS \
+curl -H "Host:event-greeter.knativetutorial.example.com" $IP_ADDRESS \
    -H "Content-Type: application/json" \
    -d '{"message": "test message"}'
 ----
@@ -219,7 +219,7 @@ curl -H "Host: event-greeter.knativetutorial.example.com" $IP_ADDRESS \
 [source,bash,subs="+macros,+attributes",linenums]
 ----
 http POST $IP_ADDRESS \
-  'Host: event-greeter.knativetutorial.example.com'  \
+  'Host:event-greeter.knativetutorial.example.com'  \
    message="test message"
 ----
 

documentation/modules/ROOT/pages/05-build/build.adoc

@@ -306,7 +306,7 @@ include::ROOT:partial$invoke-service.adoc[tag=env]
 
 [source,bash,subs="+macros,+attributes",linenums]
 ----
-curl -H "Host: event-greeter.knativetutorial.example.com" $IP_ADDRESS \
+curl -H "Host:event-greeter.knativetutorial.example.com" $IP_ADDRESS \
    -H "Content-Type: application/json" \
    -d '{"message": "test message"}'
 ----
@@ -316,7 +316,7 @@ curl -H "Host: event-greeter.knativetutorial.example.com" $IP_ADDRESS \
 [source,bash,subs="+macros,+attributes",linenums]
 ----
 http POST $IP_ADDRESS \
-  'Host: event-greeter.knativetutorial.example.com'  \
+  'Host:event-greeter.knativetutorial.example.com'  \
    message="test message"
 ----
 

documentation/modules/ROOT/pages/_partials/invoke-service.adoc

@@ -11,13 +11,13 @@ IP_ADDRESS="$({k8s-env} ip):$({k8s-cli} get svc $INGRESSGATEWAY --namespace isti
 #tag::call[]
 [source,bash,subs="+macros,+attributes"]
 ----
-curl -v -H "Host: greeter.knativetutorial.example.com" $IP_ADDRESS 
+curl -v -H "Host:greeter.knativetutorial.example.com" $IP_ADDRESS
 ----
 
 .(OR)
 
 [source,bash,subs="+macros,+attributes"]
 ----
-http $IP_ADDRESS 'Host: greeter.knativetutorial.example.com'
+http $IP_ADDRESS 'Host:greeter.knativetutorial.example.com'
 ----
 #end::call[]

documentation/modules/ROOT/pages/faq.adoc

@@ -17,11 +17,10 @@ if kubectl get configmap config-istio -n knative-serving &> /dev/null; then
     INGRESSGATEWAY=istio-ingressgateway
 fi
 
-INGRESSGATEWAY=istio-ingressgateway
 IP_ADDRESS="$(minishift ip):$(kubectl get svc $INGRESSGATEWAY --namespace istio-system --output 'jsonpath={.spec.ports[?(@.port==80)].nodePort}')"
 
 # calling a knative service named greeter
-curl -H "Host: greeter.knativetutorial.example.com" $IP_ADDRESS 
+curl -H "Host:greeter.knativetutorial.example.com" $IP_ADDRESS
 ----
 
 [#faq-q2]