How to use

StringDictionary

in

xapi.collect.api

 @Override
 public void set(final String key) {
  final String value = headers.getValue(key);
  connect.setRequestProperty(key, value);
 }
});

protected Dictionary<String, String> normalizeHeaders(StringDictionary<String> headers) {
 if (headers == null) {
  headers = X_Collect.newDictionary();
 }
 if (!headers.hasKey("X-Gwt-Version")) {
  headers.setValue("X-Gwt-Version", GWT.getPermutationStrongName());
 }
 if (!headers.hasKey("X-Gwt-Module")) {
  headers.setValue("X-Gwt-Module", GWT.getModuleName());
 }
 return headers;
}

@Override
public IORequestBuilder<Out> setHeader(final String header, final String value) {
 headers.setValue(header, value);
 return this;
}

connect.setDoOutput(false);
if (headers != null) {
 headers.forKeys(new ReceivesValue<String>() {
  @Override
  public void set(final String key) {

connect.setDoOutput(true);
if (headers != null) {
 headers.forKeys(new ReceivesValue<String>() {
  @Override
  public void set(final String key) {

 @Override
 public void set(final String key) {
  final String value = headers.getValue(key);
  connect.setRequestProperty(key, value);
 }
});

 @Override
 public void set(final String key) {
  final String value = headers.getValue(key);
  assert value != null : "Cannot set a null header value for "+key+"; url: "+url;
  request.setHeader(key, value);
 }
});

 @Override
 public void set(final String key) {
  final String value = headers.getValue(key);
  request.setHeader(key, value);
 }
});