Java Utililty Methods HTTP Header

void addCustomHeaders(HttpURLConnection conn, Map headers)
add Custom Headers

for (Map.Entry<String, String> entry : headers.entrySet()) {
 addHeader(conn, entry.getKey(), entry.getValue());

void addHeader(HttpURLConnection conn, String headerName, String value)
add Header

conn.setRequestProperty(headerName, value);

void addHeadersToRequest(HttpURLConnection request, Map headers)
add Headers To Request

if (headers != null) {
 for (String key : headers.keySet()) {
 request.addRequestProperty(key, headers.get(key));

void copyHttpHeaders(@Nonnull final HttpURLConnection aConn, @Nonnull final InternetHeaders aHeaders)
Copy headers from an Http connection to an InternetHeaders object

for (final Map.Entry<String, List<String>> aConnHeader : aConn.getHeaderFields().entrySet()) {
 final String sHeaderName = aConnHeader.getKey();
 if (sHeaderName != null)
 for (final String sHeaderValue : aConnHeader.getValue()) {
 if (aHeaders.getHeader(sHeaderName) == null)
 aHeaders.setHeader(sHeaderName, sHeaderValue);
 else
 aHeaders.addHeader(sHeaderName, sHeaderValue);
...

HttpURLConnection createHttpConnection(URL endpointUrl, String httpMethod, Map headers)
create Http Connection

try {
 HttpURLConnection connection = (HttpURLConnection) endpointUrl.openConnection();
 connection.setRequestMethod(httpMethod);
 if (headers != null) {
 System.out.println("--------- Request headers ---------");
 for (String headerKey : headers.keySet()) {
 System.out.println(headerKey + ": " + headers.get(headerKey));
 connection.setRequestProperty(headerKey, headers.get(headerKey));
...

String delete(String url, Map headers)
Send a delete request

return fetch("DELETE", url, null, headers);

int doDelete(URL endpoint, Map headers)
Send

HttpURLConnection urlConnection = null;
int responseCode;
try {
 urlConnection = (HttpURLConnection) endpoint.openConnection();
 try {
 urlConnection.setRequestMethod("DELETE");
 } catch (ProtocolException var33) {
 throw new Exception(
...

void dumpHeaders(HttpURLConnection conn)
dump Headers

String name;
String value;
for (int i = 0; i < 20; i++) {
 name = conn.getHeaderFieldKey(i);
 value = conn.getHeaderField(i);
 if (name == null && value == null)
 break;
 System.out.println(name + "=" + value);
...

void dumpHeaders(HttpURLConnection conn, PrintStream out)
dump Headers

for (Map.Entry<String, List<String>> e : conn.getHeaderFields().entrySet())
 for (String v : e.getValue())
 out.println("received header " + e.getKey() + ": " + v);

void dumpHttpHeaders(HttpURLConnection conn, java.io.PrintStream out)
dump Http Headers

Map<String, List<String>> map = conn.getHeaderFields();
out.println("Printing All Response Header for URL: " + conn.getURL().toString() + "\n");
for (Map.Entry<String, List<String>> entry : map.entrySet()) {
 out.println(entry.getKey() + " : " + entry.getValue());