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headers.go
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/
headers.go
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// Package headers provides middleware that appends headers to
// requests based on a set of configuration rules that define
// which routes receive which headers.
package headers
import (
"net/http"
"strings"
"github.com/mholt/caddy/middleware"
)
// Headers is middleware that adds headers to the responses
// for requests matching a certain path.
type Headers struct {
Next middleware.Handler
Rules []Rule
}
// ServeHTTP implements the middleware.Handler interface and serves requests,
// setting headers on the response according to the configured rules.
func (h Headers) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
for _, rule := range h.Rules {
if middleware.Path(r.URL.Path).Matches(rule.Path) {
for _, header := range rule.Headers {
if strings.HasPrefix(header.Name, "-") {
w.Header().Del(strings.TrimLeft(header.Name, "-"))
} else {
w.Header().Set(header.Name, header.Value)
}
}
}
}
return h.Next.ServeHTTP(w, r)
}
type (
// Rule groups a slice of HTTP headers by a URL pattern.
// TODO: use http.Header type instead?
Rule struct {
Path string
Headers []Header
}
// Header represents a single HTTP header, simply a name and value.
Header struct {
Name string
Value string
}
)