Set request and response headers

lib/kamal/commands/proxy.rb

@@ -34,7 +34,6 @@ class Kamal::Commands::Proxy < Kamal::Commands::Base
   end
 
   def deploy(service, target:)
-    optionize({ target: target })
     docker :exec, container_name, "kamal-proxy", :deploy, service, *optionize({ target: target }), *proxy_config.deploy_command_args
   end
 

lib/kamal/configuration/docs/proxy.yml

@@ -93,6 +93,19 @@ proxy:
     max_response_body: 0
     memory: 2_000_000
 
+  # Logging
+  #
+  # Configure request logging for the proxy
+  # You can specify request and response headers to log.
+  # By default, Cache-Control and Last-Modified request headers are logged
+  logging:
+    request_headers:
+      - Cache-Control
+      - X-Forwarded-Proto
+    response_headers:
+      - X-Request-ID
+      - X-Request-Start
+
   # Forward headers
   #
   # Whether to forward the X-Forwarded-For and X-Forwarded-Proto headers (defaults to false)

lib/kamal/configuration/proxy.rb

@@ -4,6 +4,7 @@ class Kamal::Configuration::Proxy
   DEFAULT_HTTP_PORT = 80
   DEFAULT_HTTPS_PORT = 443
   DEFAULT_IMAGE = "basecamp/kamal-proxy:latest"
+  DEFAULT_LOG_REQUEST_HEADERS = [ "Cache-Control", "Last-Modified" ]
 
   delegate :argumentize, :optionize, to: Kamal::Utils
 
@@ -50,7 +51,9 @@ class Kamal::Configuration::Proxy
       "buffer-memory": proxy_config.dig("buffer", "memory"),
       "max-request-body": proxy_config.dig("buffer", "max_request_body"),
       "max-response-body": proxy_config.dig("buffer", "max_response_body"),
-      "forward-headers": proxy_config.dig("forward_headers")
+      "forward-headers": proxy_config.dig("forward_headers"),
+      "log-request-header": proxy_config.dig("logging", "request_headers") || DEFAULT_LOG_REQUEST_HEADERS,
+      "log-response-header": proxy_config.dig("logging", "response_headers")
     }.compact
   end