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+# Placeholders
+
+Some directives allow you to use placeholders in your Caddyfile to fill out a value differently for every request. For example, the value {path} would be replaced by the path portion of the request URL. These are also called replaceable values.
+These placeholders only work on directives that support them. Check the documentation for your directive to see if placeholders are supported.
+Request Placeholders
+
+These values are obtained from the request.
+
+* {dir} - The directory of the requested file (from request URI)
+* { file} - The name of the requested file (from request URI)
+* {fragment} - The last part of the URL starting with "#"
+* {>Header} - Any request header, where "Header" is the header field name
+* {host} - The host portion of the request
+* {method} - The request method (GET, POST, etc.)
+* {path} - The path portion of the URL (does not include query string or fragment)
+* {port} - The client's port
+* {proto} - The protocol string (e.g. "HTTP/1.1")
+* {query} - The query string portion of the URL, without leading "?"
+* {remote} - The client's IP address
+* {scheme} - The protocol/scheme used (usually http or https)
+* {uri} - The request URI (includes path, query string, and fragment)
+* {when} - Timestamp in the format 02/Jan/2006:15:04:05 -0700
+
+## Response Placeholders
+
+These values are obtained from the response, and are only implemented with some directives. Make sure your directive supports response placeholders before attempting to use them.
+
+* {latency} - Approximate time the server spent handling the request
+* {size} - The size of the response body
+* {status} - The HTTP status code of the response