checkArgument(
          !portString.startsWith("+") && CharMatcher.ascii().matchesAllOf(portString),
          "Unparseable port number: %s",
          hostPortString);
      try {
        port = Integer.parseInt(portString);
      } catch (NumberFormatException e) {
        throw new IllegalArgumentException("Unparseable port number: " + hostPortString);
      }

          <description>
            The proxy password.
          </description>
          <type>String</type>
        </field>
        <field xml.tagName="port">
          <name>portString</name>
          <version>1.0.0+</version>
          <description>
            The proxy port. Note: While the type of this field is {@code String} for technical

		return 0, fmt.Errorf("failed parsing port %q: %v", portStr, err)
	}
	return uint16(port), nil
}

func parsePorts(portsString string) ([]int, error) {
	portsString = strings.TrimSpace(portsString)
	ports := make([]int, 0)
	if len(portsString) > 0 {
		for _, portStr := range splitPorts(portsString) {
			port, err := parsePort(portStr)
			if err != nil {
				return nil, err
			}
			ports = append(ports, int(port))

 [PostStringJava]: https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PostString.java
 [PostStringKotlin]: https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/kt/PostString.kt
 [PostStreamingJava]: https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PostStreaming.java