caddy-frontend: Simplify logic, as only strings are provided

software/caddy-frontend/buildout.hash.cfg

@@ -58,7 +58,7 @@ md5sum = f20d6c3d2d94fb685f8d26dfca1e822b
 
 [template-default-slave-virtualhost]
 filename = templates/default-virtualhost.conf.in
-md5sum = 26e634a37dd6ab17c75207d4fbbaa65a
+md5sum = e57b9ae012f777482295698a23b7e850
 
 [template-cached-slave-virtualhost]
 filename = templates/cached-virtualhost.conf.in

software/caddy-frontend/templates/default-virtualhost.conf.in

 {%- set TRUE_VALUES = ['y', 'yes', '1', 'true'] %}
-{%- set disable_no_cache_header = ('' ~ slave_parameter.get('disable-no-cache-request', '')).lower() in TRUE_VALUES %}
-{%- set disable_via_header = ('' ~ slave_parameter.get('disable-via-header', '')).lower() in TRUE_VALUES %}
-{%- set prefer_gzip = ('' ~ slave_parameter.get('prefer-gzip-encoding-to-backend', '')).lower() in TRUE_VALUES %}
+{%- set disable_no_cache_header = slave_parameter.get('disable-no-cache-request', '').lower() in TRUE_VALUES %}
+{%- set disable_via_header = slave_parameter.get('disable-via-header', '').lower() in TRUE_VALUES %}
+{%- set prefer_gzip = slave_parameter.get('prefer-gzip-encoding-to-backend', '').lower() in TRUE_VALUES %}
 {%- set proxy_append_list = [('', 'Default proxy configuration')] %}
 {%- if prefer_gzip %}
 {%- do proxy_append_list.append(('prefer-gzip', 'Proxy which always overrides Accept-Encoding to gzip if such is found')) %}
 {%- endif %} {#- if prefer_gzip #}
 {%- set server_alias_list =  slave_parameter.get('server-alias', '').split() %}
-{%- set enable_h2 = slave_parameter['global_disable_http2'].lower() not in TRUE_VALUES and ('' ~ slave_parameter.get('enable-http2', slave_parameter['enable_http2_by_default'])).lower() in TRUE_VALUES %}
-{%- set ssl_proxy_verify = ('' ~ slave_parameter.get('ssl-proxy-verify', '')).lower() in TRUE_VALUES %}
+{%- set enable_h2 = slave_parameter['global_disable_http2'].lower() not in TRUE_VALUES and slave_parameter.get('enable-http2', slave_parameter['enable_http2_by_default']).lower() in TRUE_VALUES %}
+{%- set ssl_proxy_verify = slave_parameter.get('ssl-proxy-verify', '').lower() in TRUE_VALUES %}
 {%- set disabled_cookie_list =  slave_parameter.get('disabled-cookie-list', '').split() %}
-{%- set https_only = ('' ~ slave_parameter.get('https-only', '')).lower() in TRUE_VALUES %}
+{%- set https_only = slave_parameter.get('https-only', '').lower() in TRUE_VALUES %}
 {%- set slave_type = slave_parameter.get('type', '') %}
 {%- set host_list = server_alias_list %}
 {%- if slave_parameter.get('custom_domain') not in host_list %}