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/*
* oauth2-oidc-sdk
*
* Copyright 2012-2016, Connect2id Ltd and contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use
* this file except in compliance with the License. You may obtain a copy of the
* License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed
* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package com.nimbusds.oauth2.sdk.http;
import java.io.*;
import java.net.*;
import java.nio.charset.StandardCharsets;
import java.security.cert.X509Certificate;
import java.util.List;
import java.util.Map;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;
import net.jcip.annotations.ThreadSafe;
import net.minidev.json.JSONObject;
import com.nimbusds.common.contenttype.ContentType;
import com.nimbusds.jwt.SignedJWT;
import com.nimbusds.oauth2.sdk.ParseException;
import com.nimbusds.oauth2.sdk.SerializeException;
import com.nimbusds.oauth2.sdk.util.JSONObjectUtils;
import com.nimbusds.oauth2.sdk.util.URLUtils;
/**
* HTTP request with support for the parameters required to construct an
* {@link com.nimbusds.oauth2.sdk.Request OAuth 2.0 request message}.
*
* Supported HTTP methods:
*
*
* - {@link Method#GET HTTP GET}
*
- {@link Method#POST HTTP POST}
*
- {@link Method#POST HTTP PUT}
*
- {@link Method#POST HTTP DELETE}
*
*
* Supported request headers:
*
*
* - Content-Type
*
- Authorization
*
- Accept
*
- Etc.
*
*
* Supported timeouts:
*
*
* - On HTTP connect
*
- On HTTP response read
*
*
* HTTP 3xx redirection: follow (default) / don't follow
*/
@ThreadSafe
public class HTTPRequest extends HTTPMessage {
/**
* Enumeration of the HTTP methods used in OAuth 2.0 requests.
*/
public enum Method {
/**
* HTTP GET.
*/
GET,
/**
* HTTP POST.
*/
POST,
/**
* HTTP PUT.
*/
PUT,
/**
* HTTP DELETE.
*/
DELETE
}
/**
* The request method.
*/
private final Method method;
/**
* The request URL.
*/
private final URL url;
/**
* The query string / post body.
*/
private String query = null;
/**
* The fragment.
*/
private String fragment = null;
/**
* The HTTP connect timeout, in milliseconds. Zero implies none.
*/
private int connectTimeout = 0;
/**
* The HTTP response read timeout, in milliseconds. Zero implies none.
*/
private int readTimeout = 0;
/**
* Do not use a connection specific proxy by default.
*/
private Proxy proxy = null;
/**
* Controls HTTP 3xx redirections.
*/
private boolean followRedirects = true;
/**
* The received validated client X.509 certificate for a received HTTPS
* request, {@code null} if not specified.
*/
private X509Certificate clientX509Certificate = null;
/**
* The subject DN of a received client X.509 certificate for a received
* HTTPS request, {@code null} if not specified.
*/
private String clientX509CertificateSubjectDN = null;
/**
* The root issuer DN of a received client X.509 certificate for a
* received HTTPS request, {@code null} if not specified.
*/
private String clientX509CertificateRootDN = null;
/**
* The hostname verifier to use for outgoing HTTPS requests,
* {@code null} implies the default one.
*/
private HostnameVerifier hostnameVerifier = null;
/**
* The SSL socket factory to use for outgoing HTTPS requests,
* {@code null} implies the default one.
*/
private SSLSocketFactory sslSocketFactory = null;
/**
* The default hostname verifier for all outgoing HTTPS requests.
*/
private static HostnameVerifier defaultHostnameVerifier = HttpsURLConnection.getDefaultHostnameVerifier();
/**
* The default socket factory for all outgoing HTTPS requests.
*/
private static SSLSocketFactory defaultSSLSocketFactory = (SSLSocketFactory)SSLSocketFactory.getDefault();
/**
* Creates a new minimally specified HTTP request.
*
* @param method The HTTP request method. Must not be {@code null}.
* @param url The HTTP request URL. Must not be {@code null}.
*/
public HTTPRequest(final Method method, final URL url) {
if (method == null)
throw new IllegalArgumentException("The HTTP method must not be null");
this.method = method;
if (url == null)
throw new IllegalArgumentException("The HTTP URL must not be null");
this.url = url;
}
/**
* Creates a new minimally specified HTTP request.
*
* @param method The HTTP request method. Must not be {@code null}.
* @param uri The HTTP request URI. Must be an URL and not
* {@code null}.
*/
public HTTPRequest(final Method method, final URI uri) {
this(method, toURLWithUncheckedException(uri));
}
private static URL toURLWithUncheckedException(final URI uri) {
try {
return uri.toURL();
} catch (MalformedURLException | IllegalArgumentException e) {
throw new SerializeException(e.getMessage(), e);
}
}
/**
* Gets the request method.
*
* @return The request method.
*/
public Method getMethod() {
return method;
}
/**
* Gets the request URL.
*
* @return The request URL.
*/
public URL getURL() {
return url;
}
/**
* Gets the request URL as URI.
*
* @return The request URL as URI.
*/
public URI getURI() {
try {
return url.toURI();
} catch (URISyntaxException e) {
// Should never happen
throw new IllegalStateException(e.getMessage(), e);
}
}
/**
* Ensures this HTTP request has the specified method.
*
* @param expectedMethod The expected method. Must not be {@code null}.
*
* @throws ParseException If the method doesn't match the expected.
*/
public void ensureMethod(final Method expectedMethod)
throws ParseException {
if (method != expectedMethod)
throw new ParseException("The HTTP request method must be " + expectedMethod);
}
/**
* Gets the {@code Authorization} header value.
*
* @return The {@code Authorization} header value, {@code null} if not
* specified.
*/
public String getAuthorization() {
return getHeaderValue("Authorization");
}
/**
* Sets the {@code Authorization} header value.
*
* @param authz The {@code Authorization} header value, {@code null} if
* not specified.
*/
public void setAuthorization(final String authz) {
setHeader("Authorization", authz);
}
/**
* Gets the {@code DPoP} header value.
*
* @return The {@code DPoP} header value, {@code null} if not specified
* or parsing failed.
*/
public SignedJWT getDPoP() {
try {
return getPoPWithException();
} catch (ParseException e) {
return null;
}
}
/**
* Gets the {@code DPoP} header value.
*
* @return The {@code DPoP} header value, {@code null} if not
* specified.
*
* @throws ParseException If JWT parsing failed.
*/
public SignedJWT getPoPWithException()
throws ParseException {
String dPoP = getHeaderValue("DPoP");
if (dPoP == null) {
return null;
}
try {
return SignedJWT.parse(dPoP);
} catch (java.text.ParseException e) {
throw new ParseException(e.getMessage(), e);
}
}
/**
* Sets the {@code DPoP} header value.
*
* @param dPoPJWT The {@code DPoP} header value, {@code null} if not
* specified.
*/
public void setDPoP(final SignedJWT dPoPJWT) {
if (dPoPJWT != null) {
setHeader("DPoP", dPoPJWT.serialize());
} else {
setHeader("DPoP", (String[]) null);
}
}
/**
* Gets the {@code Accept} header value.
*
* @return The {@code Accept} header value, {@code null} if not
* specified.
*/
public String getAccept() {
return getHeaderValue("Accept");
}
/**
* Sets the {@code Accept} header value.
*
* @param accept The {@code Accept} header value, {@code null} if not
* specified.
*/
public void setAccept(final String accept) {
setHeader("Accept", accept);
}
/**
* Gets the raw (undecoded) query string if the request is HTTP GET or
* the entity body if the request is HTTP POST.
*
*
Note that the '?' character preceding the query string in GET
* requests is not included in the returned string.
*
*
Example query string (line breaks for clarity):
*
*
* response_type=code
* &client_id=s6BhdRkqt3
* &state=xyz
* &redirect_uri=https%3A%2F%2Fclient%2Eexample%2Ecom%2Fcb
*
*
* @return For HTTP GET requests the URL query string, for HTTP POST
* requests the body. {@code null} if not specified.
*/
public String getQuery() {
return query;
}
/**
* Sets the raw (undecoded) query string if the request is HTTP GET or
* the entity body if the request is HTTP POST.
*
* Note that the '?' character preceding the query string in GET
* requests must not be included.
*
*
Example query string (line breaks for clarity):
*
*
* response_type=code
* &client_id=s6BhdRkqt3
* &state=xyz
* &redirect_uri=https%3A%2F%2Fclient%2Eexample%2Ecom%2Fcb
*
*
* @param query For HTTP GET requests the URL query string, for HTTP
* POST requests the body. {@code null} if not specified.
*/
public void setQuery(final String query) {
this.query = query;
}
/**
* Ensures this HTTP response has a specified query string or entity
* body.
*
* @throws ParseException If the query string or entity body is missing
* or empty.
*/
private void ensureQuery()
throws ParseException {
if (query == null || query.trim().isEmpty())
throw new ParseException("Missing or empty HTTP query string / entity body");
}
/**
* Gets the request query as a parameter map. The parameters are
* decoded according to {@code application/x-www-form-urlencoded}.
*
* @return The request query parameters, decoded. If none the map will
* be empty.
*/
public Map> getQueryParameters() {
return URLUtils.parseParameters(query);
}
/**
* Gets the request query or entity body as a JSON Object.
*
* @return The request query or entity body as a JSON object.
*
* @throws ParseException If the Content-Type header isn't
* {@code application/json}, the request query
* or entity body is {@code null}, empty or
* couldn't be parsed to a valid JSON object.
*/
public JSONObject getQueryAsJSONObject()
throws ParseException {
ensureEntityContentType(ContentType.APPLICATION_JSON);
ensureQuery();
return JSONObjectUtils.parse(query);
}
/**
* Gets the raw (undecoded) request fragment.
*
* @return The request fragment, {@code null} if not specified.
*/
public String getFragment() {
return fragment;
}
/**
* Sets the raw (undecoded) request fragment.
*
* @param fragment The request fragment, {@code null} if not specified.
*/
public void setFragment(final String fragment) {
this.fragment = fragment;
}
/**
* Gets the HTTP connect timeout.
*
* @return The HTTP connect timeout, in milliseconds. Zero implies no
* timeout.
*/
public int getConnectTimeout() {
return connectTimeout;
}
/**
* Sets the HTTP connect timeout.
*
* @param connectTimeout The HTTP connect timeout, in milliseconds.
* Zero implies no timeout. Must not be negative.
*/
public void setConnectTimeout(final int connectTimeout) {
if (connectTimeout < 0) {
throw new IllegalArgumentException("The HTTP connect timeout must be zero or positive");
}
this.connectTimeout = connectTimeout;
}
/**
* Gets the HTTP response read timeout.
*
* @return The HTTP response read timeout, in milliseconds. Zero
* implies no timeout.
*/
public int getReadTimeout() {
return readTimeout;
}
/**
* Sets the HTTP response read timeout.
*
* @param readTimeout The HTTP response read timeout, in milliseconds.
* Zero implies no timeout. Must not be negative.
*/
public void setReadTimeout(final int readTimeout) {
if (readTimeout < 0) {
throw new IllegalArgumentException("The HTTP response read timeout must be zero or positive");
}
this.readTimeout = readTimeout;
}
/**
* Returns the proxy to use for this HTTP request.
*
* @return The connection specific proxy for this request, {@code null}
* for the default proxy strategy.
*/
public Proxy getProxy() {
return this.proxy;
}
/**
* Tunnels this HTTP request via the specified {@link Proxy} by
* directly configuring the proxy on the {@link java.net.URLConnection}.
* The proxy is only used for this instance and bypasses any other
* proxy settings (such as set via System properties or
* {@link java.net.ProxySelector}). Supplying {@code null} (the
* default) reverts to the default proxy strategy of
* {@link java.net.URLConnection}. If the goal is to avoid using a
* proxy at all supply {@link Proxy#NO_PROXY}.
*
* @param proxy The connection specific proxy to use, {@code null} to
* use the default proxy strategy.
*
* @see URL#openConnection(Proxy)
*/
public void setProxy(final Proxy proxy) {
this.proxy = proxy;
}
/**
* Gets the boolean setting whether HTTP redirects (requests with
* response code 3xx) should be automatically followed.
*
* @return {@code true} if HTTP redirects are automatically followed,
* else {@code false}.
*/
public boolean getFollowRedirects() {
return followRedirects;
}
/**
* Sets whether HTTP redirects (requests with response code 3xx) should
* be automatically followed.
*
* @param follow Whether or not to follow HTTP redirects.
*/
public void setFollowRedirects(final boolean follow) {
followRedirects = follow;
}
/**
* Gets the received validated client X.509 certificate for a received
* HTTPS request.
*
* @return The client X.509 certificate, {@code null} if not specified.
*/
public X509Certificate getClientX509Certificate() {
return clientX509Certificate;
}
/**
* Sets the received validated client X.509 certificate for a received
* HTTPS request.
*
* @param clientX509Certificate The client X.509 certificate,
* {@code null} if not specified.
*/
public void setClientX509Certificate(final X509Certificate clientX509Certificate) {
this.clientX509Certificate = clientX509Certificate;
}
/**
* Gets the subject DN of a received validated client X.509 certificate
* for a received HTTPS request.
*
* @return The subject DN, {@code null} if not specified.
*/
public String getClientX509CertificateSubjectDN() {
return clientX509CertificateSubjectDN;
}
/**
* Sets the subject DN of a received validated client X.509 certificate
* for a received HTTPS request.
*
* @param subjectDN The subject DN, {@code null} if not specified.
*/
public void setClientX509CertificateSubjectDN(final String subjectDN) {
this.clientX509CertificateSubjectDN = subjectDN;
}
/**
* Gets the root issuer DN of a received validated client X.509
* certificate for a received HTTPS request.
*
* @return The root DN, {@code null} if not specified.
*/
public String getClientX509CertificateRootDN() {
return clientX509CertificateRootDN;
}
/**
* Sets the root issuer DN of a received validated client X.509
* certificate for a received HTTPS request.
*
* @param rootDN The root DN, {@code null} if not specified.
*/
public void setClientX509CertificateRootDN(final String rootDN) {
this.clientX509CertificateRootDN = rootDN;
}
/**
* Gets the hostname verifier for outgoing HTTPS requests.
*
* @return The hostname verifier, {@code null} implies use of the
* {@link #getDefaultHostnameVerifier() default one}.
*/
public HostnameVerifier getHostnameVerifier() {
return hostnameVerifier;
}
/**
* Sets the hostname verifier for outgoing HTTPS requests.
*
* @param hostnameVerifier The hostname verifier, {@code null} implies
* use of the
* {@link #getDefaultHostnameVerifier() default
* one}.
*/
public void setHostnameVerifier(final HostnameVerifier hostnameVerifier) {
this.hostnameVerifier = hostnameVerifier;
}
/**
* Gets the SSL factory for outgoing HTTPS requests.
*
* @return The SSL factory, {@code null} implies of the default one.
*/
public SSLSocketFactory getSSLSocketFactory() {
return sslSocketFactory;
}
/**
* Sets the SSL factory for outgoing HTTPS requests. Use the
* {@link com.nimbusds.oauth2.sdk.util.tls.TLSUtils TLS utility} to
* set a custom trust store for server and CA certificates and / or a
* custom key store for client private keys and certificates, also to
* select a specific TLS protocol version.
*
* @param sslSocketFactory The SSL factory, {@code null} implies use of
* the default one.
*/
public void setSSLSocketFactory(final SSLSocketFactory sslSocketFactory) {
this.sslSocketFactory = sslSocketFactory;
}
/**
* Returns the default hostname verifier for all outgoing HTTPS
* requests.
*
* @return The hostname verifier.
*/
public static HostnameVerifier getDefaultHostnameVerifier() {
return defaultHostnameVerifier;
}
/**
* Sets the default hostname verifier for all outgoing HTTPS requests.
* Can be overridden on a individual request basis.
*
* @param defaultHostnameVerifier The hostname verifier. Must not be
* {@code null}.
*/
public static void setDefaultHostnameVerifier(final HostnameVerifier defaultHostnameVerifier) {
if (defaultHostnameVerifier == null) {
throw new IllegalArgumentException("The hostname verifier must not be null");
}
HTTPRequest.defaultHostnameVerifier = defaultHostnameVerifier;
}
/**
* Returns the default SSL socket factory for all outgoing HTTPS
* requests.
*
* @return The SSL socket factory.
*/
public static SSLSocketFactory getDefaultSSLSocketFactory() {
return defaultSSLSocketFactory;
}
/**
* Sets the default SSL socket factory for all outgoing HTTPS requests.
* Can be overridden on a individual request basis. Use the
* {@link com.nimbusds.oauth2.sdk.util.tls.TLSUtils TLS utility} to
* set a custom trust store for server and CA certificates and / or a
* custom key store for client private keys and certificates, also to
* select a specific TLS protocol version.
*
* @param sslSocketFactory The SSL socket factory. Must not be
* {@code null}.
*/
public static void setDefaultSSLSocketFactory(final SSLSocketFactory sslSocketFactory) {
if (sslSocketFactory == null) {
throw new IllegalArgumentException("The SSL socket factory must not be null");
}
HTTPRequest.defaultSSLSocketFactory = sslSocketFactory;
}
/**
* Returns an established HTTP URL connection for this HTTP request.
* Deprecated as of v5.31, use {@link #toHttpURLConnection()} with
* {@link #setHostnameVerifier} and {@link #setSSLSocketFactory}
* instead.
*
* @param hostnameVerifier The hostname verifier for outgoing HTTPS
* requests, {@code null} implies use of the
* {@link #getDefaultHostnameVerifier() default
* one}.
* @param sslSocketFactory The SSL socket factory for HTTPS requests,
* {@code null} implies use of the
* {@link #getDefaultSSLSocketFactory() default
* one}.
*
* @return The HTTP URL connection, with the request sent and ready to
* read the response.
*
* @throws IOException If the HTTP request couldn't be made, due to a
* network or other error.
*/
@Deprecated
public HttpURLConnection toHttpURLConnection(final HostnameVerifier hostnameVerifier,
final SSLSocketFactory sslSocketFactory)
throws IOException {
HostnameVerifier savedHostnameVerifier = getHostnameVerifier();
SSLSocketFactory savedSSLFactory = getSSLSocketFactory();
try {
// Set for this HTTP URL connection only
setHostnameVerifier(hostnameVerifier);
setSSLSocketFactory(sslSocketFactory);
return toHttpURLConnection();
} finally {
setHostnameVerifier(savedHostnameVerifier);
setSSLSocketFactory(savedSSLFactory);
}
}
/**
* Returns an established HTTP URL connection for this HTTP request.
*
* @return The HTTP URL connection, with the request sent and ready to
* read the response.
*
* @throws IOException If the HTTP request couldn't be made, due to a
* network or other error.
*/
public HttpURLConnection toHttpURLConnection()
throws IOException {
URL finalURL = url;
if (query != null && (method.equals(HTTPRequest.Method.GET) || method.equals(Method.DELETE))) {
// Append query string
StringBuilder sb = new StringBuilder(url.toString());
sb.append('?');
sb.append(query);
try {
finalURL = new URL(sb.toString());
} catch (MalformedURLException e) {
throw new IOException("Couldn't append query string: " + e.getMessage(), e);
}
}
if (fragment != null) {
// Append raw fragment
StringBuilder sb = new StringBuilder(finalURL.toString());
sb.append('#');
sb.append(fragment);
try {
finalURL = new URL(sb.toString());
} catch (MalformedURLException e) {
throw new IOException("Couldn't append raw fragment: " + e.getMessage(), e);
}
}
HttpURLConnection conn = (HttpURLConnection) (proxy == null ? finalURL.openConnection() : finalURL.openConnection(proxy));
if (conn instanceof HttpsURLConnection) {
HttpsURLConnection sslConn = (HttpsURLConnection)conn;
sslConn.setHostnameVerifier(hostnameVerifier != null ? hostnameVerifier : getDefaultHostnameVerifier());
sslConn.setSSLSocketFactory(sslSocketFactory != null ? sslSocketFactory : getDefaultSSLSocketFactory());
}
for (Map.Entry> header: getHeaderMap().entrySet()) {
for (String headerValue: header.getValue()) {
conn.addRequestProperty(header.getKey(), headerValue);
}
}
conn.setRequestMethod(method.name());
conn.setConnectTimeout(connectTimeout);
conn.setReadTimeout(readTimeout);
conn.setInstanceFollowRedirects(followRedirects);
if (method.equals(HTTPRequest.Method.POST) || method.equals(Method.PUT)) {
conn.setDoOutput(true);
if (getEntityContentType() != null)
conn.setRequestProperty("Content-Type", getEntityContentType().toString());
if (query != null) {
try {
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
writer.write(query);
writer.close();
} catch (IOException e) {
closeStreams(conn);
throw e; // Rethrow
}
}
}
return conn;
}
/**
* Sends this HTTP request to the request URL and retrieves the
* resulting HTTP response. Deprecated as of v5.31, use
* {@link #toHttpURLConnection()} with {@link #setHostnameVerifier} and
* {@link #setSSLSocketFactory} instead.
*
* @param hostnameVerifier The hostname verifier for outgoing HTTPS
* requests, {@code null} implies use of the
* {@link #getDefaultHostnameVerifier() default
* one}.
* @param sslSocketFactory The SSL socket factory for HTTPS requests,
* {@code null} implies use of the
* {@link #getDefaultSSLSocketFactory() default
* one}.
*
* @return The resulting HTTP response.
*
* @throws IOException If the HTTP request couldn't be made, due to a
* network or other error.
*/
@Deprecated
public HTTPResponse send(final HostnameVerifier hostnameVerifier,
final SSLSocketFactory sslSocketFactory)
throws IOException {
HostnameVerifier savedHostnameVerifier = getHostnameVerifier();
SSLSocketFactory savedSSLFactory = getSSLSocketFactory();
try {
// Set for this HTTP URL connection only
setHostnameVerifier(hostnameVerifier);
setSSLSocketFactory(sslSocketFactory);
return send();
} finally {
setHostnameVerifier(savedHostnameVerifier);
setSSLSocketFactory(savedSSLFactory);
}
}
/**
* Sends this HTTP request to the request URL and retrieves the
* resulting HTTP response.
*
* @return The resulting HTTP response.
*
* @throws IOException If the HTTP request couldn't be made, due to a
* network or other error.
*/
public HTTPResponse send()
throws IOException {
HttpURLConnection conn = toHttpURLConnection();
int statusCode;
BufferedReader reader;
try {
// Open a connection, then send method and headers
reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
// The next step is to get the status
statusCode = conn.getResponseCode();
} catch (IOException e) {
// HttpUrlConnection will throw an IOException if any
// 4XX response is sent. If we request the status
// again, this time the internal status will be
// properly set, and we'll be able to retrieve it.
statusCode = conn.getResponseCode();
if (statusCode == -1) {
throw e; // Rethrow IO exception
} else {
// HTTP status code indicates the response got
// through, read the content but using error stream
InputStream errStream = conn.getErrorStream();
if (errStream != null) {
// We have useful HTTP error body
reader = new BufferedReader(new InputStreamReader(errStream));
} else {
// No content, set to empty string
reader = new BufferedReader(new StringReader(""));
}
}
}
StringBuilder body = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
body.append(line);
body.append(System.getProperty("line.separator"));
}
reader.close();
HTTPResponse response = new HTTPResponse(statusCode);
response.setStatusMessage(conn.getResponseMessage());
// Set headers
for (Map.Entry> responseHeader: conn.getHeaderFields().entrySet()) {
if (responseHeader.getKey() == null) {
continue; // skip header
}
List values = responseHeader.getValue();
if (values == null || values.isEmpty() || values.get(0) == null) {
continue; // skip header
}
response.setHeader(responseHeader.getKey(), values.toArray(new String[]{}));
}
closeStreams(conn);
final String bodyContent = body.toString();
if (! bodyContent.isEmpty())
response.setContent(bodyContent);
return response;
}
/**
* Closes the input, output and error streams of the specified HTTP URL
* connection. No attempt is made to close the underlying socket with
* {@code conn.disconnect} so it may be cached (HTTP 1.1 keep live).
* See http://techblog.bozho.net/caveats-of-httpurlconnection/
*
* @param conn The HTTP URL connection. May be {@code null}.
*/
private static void closeStreams(final HttpURLConnection conn) {
if (conn == null) {
return;
}
try {
if (conn.getInputStream() != null) {
conn.getInputStream().close();
}
} catch (Exception e) {
// ignore
}
try {
if (conn.getOutputStream() != null) {
conn.getOutputStream().close();
}
} catch (Exception e) {
// ignore
}
try {
if (conn.getErrorStream() != null) {
conn.getOutputStream().close();
}
} catch (Exception e) {
// ignore
}
}
}