anchor.diff:   * encoding used will be determined from the "charset" parameter of
    * the "Content-Type" header.
    *
  - *   HttpClientRequest request = ...
  - *   request.headers.contentType
  - *       = new ContentType("application", "json", charset: "utf-8");
  - *   request.write(...);  // Strings written will be UTF-8 encoded.
  + *     HttpClientRequest request = ...
  + *     request.headers.contentType
  + *         = new ContentType("application", "json", charset: "utf-8");
  + *     request.write(...);  // Strings written will be UTF-8 encoded.
    *
    * If no charset is provided the default of ISO-8859-1 (Latin 1) will
    * be used.
    *
  - *   HttpClientRequest request = ...
  - *   request.headers.add(HttpHeaders.CONTENT_TYPE, "text/plain");
  - *   request.write(...);  // Strings written will be ISO-8859-1 encoded.
  + *     HttpClientRequest request = ...
  + *     request.headers.add(HttpHeaders.CONTENT_TYPE, "text/plain");
  + *     request.write(...);  // Strings written will be ISO-8859-1 encoded.
    *
    * If an unsupported encoding is used an exception will be thrown if
    * using one of the write methods taking a string.
  
positive.code:    * To activate this way of resolving proxies assign this function to
     * the [findProxy] property on the [HttpClient].
     *
     *   HttpClient client = new HttpClient();
     *   client.findProxy = HttpClient.findProxyFromEnvironment;
     *
     * If you don't want to use the system environment you can use a
     * different one by wrapping the function.
     *
     *   HttpClient client = new HttpClient();
     *   client.findProxy = (url) {
     *     return HttpClient.findProxyFromEnvironment(
     *         url, {"http_proxy": ..., "no_proxy": ...});
     *   }
     */
    static String findProxyFromEnvironment(Uri url,
                                           {Map<String, String> environment}) {
  
negative.code:  * will be determined from the "charset" parameter of the
   * "Content-Type" header.
   *
   *     HttpResponse response = ...
   *     response.headers.contentType
   *         = new ContentType("application", "json", charset: "utf-8");
   *     response.write(...);  // Strings written will be UTF-8 encoded.
   *
   * If no charset is provided the default of ISO-8859-1 (Latin 1) will
   * be used.
   *
   *     HttpResponse response = ...
   *     response.headers.add(HttpHeaders.CONTENT_TYPE, "text/plain");
   *     response.write(...);  // Strings written will be ISO-8859-1 encoded.
   *
   * If an unsupported encoding is used an exception will be thrown if
   * using one of the write methods taking a string.
  