Method ApplyTo

modules/caddyhttp/headers/headers.go:220–339

ApplyTo applies ops to hdr using repl.

(hdr http.Header, repl *caddy.Replacer)

// ApplyTo applies ops to hdr using repl.
func (ops *HeaderOps) ApplyTo(hdr http.Header, repl *caddy.Replacer) {
	if ops == nil {
		return
	}
	// before manipulating headers in other ways, check if there
	// is configuration to delete all headers, and do that first
	// because if a header is to be added, we don't want to delete
	// it also
	for _, fieldName := range ops.Delete {
		fieldName = repl.ReplaceKnown(fieldName, "")
		if fieldName == "*" {
			clear(hdr)
		}
	}

	// add
	for fieldName, vals := range ops.Add {
		fieldName = repl.ReplaceKnown(fieldName, "")
		for _, v := range vals {
			hdr.Add(fieldName, repl.ReplaceKnown(v, ""))
		}
	}

	// set
	for fieldName, vals := range ops.Set {
		fieldName = repl.ReplaceKnown(fieldName, "")
		var newVals []string
		for i := range vals {
			// append to new slice so we don't overwrite
			// the original values in ops.Set
			newVals = append(newVals, repl.ReplaceKnown(vals[i], ""))
		}
		hdr.Set(fieldName, strings.Join(newVals, ","))
	}

	// delete
	for _, fieldName := range ops.Delete {
		fieldName = strings.ToLower(repl.ReplaceKnown(fieldName, ""))
		if fieldName == "*" {
			continue // handled above
		}
		switch {
		case strings.HasPrefix(fieldName, "*") && strings.HasSuffix(fieldName, "*"):
			for existingField := range hdr {
				if strings.Contains(strings.ToLower(existingField), fieldName[1:len(fieldName)-1]) {
					delete(hdr, existingField)
				}
			}
		case strings.HasPrefix(fieldName, "*"):
			for existingField := range hdr {
				if strings.HasSuffix(strings.ToLower(existingField), fieldName[1:]) {
					delete(hdr, existingField)
				}
			}
		case strings.HasSuffix(fieldName, "*"):
			for existingField := range hdr {
				if strings.HasPrefix(strings.ToLower(existingField), fieldName[:len(fieldName)-1]) {
					delete(hdr, existingField)