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Apache HttpComponents HttpClient - Cache
/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* newWarningHeaders = new ArrayList();
boolean modified = false;
for(final Header h : warningHeaders) {
for(final WarningValue wv : WarningValue.getWarningValues(h)) {
final Date warnDate = wv.getWarnDate();
if (warnDate == null || warnDate.equals(responseDate)) {
newWarningHeaders.add(new BasicHeader(HeaderConstants.WARNING,wv.toString()));
} else {
modified = true;
}
}
}
if (modified) {
response.removeHeaders(HeaderConstants.WARNING);
for(final Header h : newWarningHeaders) {
response.addHeader(h);
}
}
}
private void identityIsNotUsedInContentEncoding(final HttpResponse response) {
final Header[] hdrs = response.getHeaders(HTTP.CONTENT_ENCODING);
if (hdrs == null || hdrs.length == 0) {
return;
}
final List newHeaders = new ArrayList();
boolean modified = false;
for (final Header h : hdrs) {
final StringBuilder buf = new StringBuilder();
boolean first = true;
for (final HeaderElement elt : h.getElements()) {
if ("identity".equalsIgnoreCase(elt.getName())) {
modified = true;
} else {
if (!first) {
buf.append(",");
}
buf.append(elt.toString());
first = false;
}
}
final String newHeaderValue = buf.toString();
if (!"".equals(newHeaderValue)) {
newHeaders.add(new BasicHeader(HTTP.CONTENT_ENCODING, newHeaderValue));
}
}
if (!modified) {
return;
}
response.removeHeaders(HTTP.CONTENT_ENCODING);
for (final Header h : newHeaders) {
response.addHeader(h);
}
}
private void ensure206ContainsDateHeader(final HttpResponse response) {
if (response.getFirstHeader(HTTP.DATE_HEADER) == null) {
response.addHeader(HTTP.DATE_HEADER, DateUtils.formatDate(new Date()));
}
}
private void ensurePartialContentIsNotSentToAClientThatDidNotRequestIt(final HttpRequest request,
final HttpResponse response) throws IOException {
if (request.getFirstHeader(HeaderConstants.RANGE) != null
|| response.getStatusLine().getStatusCode() != HttpStatus.SC_PARTIAL_CONTENT) {
return;
}
consumeBody(response);
throw new ClientProtocolException(UNEXPECTED_PARTIAL_CONTENT);
}
private void ensure200ForOPTIONSRequestWithNoBodyHasContentLengthZero(final HttpRequest request,
final HttpResponse response) {
if (!request.getRequestLine().getMethod().equalsIgnoreCase(HeaderConstants.OPTIONS_METHOD)) {
return;
}
if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
return;
}
if (response.getFirstHeader(HTTP.CONTENT_LEN) == null) {
response.addHeader(HTTP.CONTENT_LEN, "0");
}
}
private void ensure304DoesNotContainExtraEntityHeaders(final HttpResponse response) {
final String[] disallowedEntityHeaders = { HeaderConstants.ALLOW, HTTP.CONTENT_ENCODING,
"Content-Language", HTTP.CONTENT_LEN, "Content-MD5",
"Content-Range", HTTP.CONTENT_TYPE, HeaderConstants.LAST_MODIFIED
};
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_NOT_MODIFIED) {
for(final String hdr : disallowedEntityHeaders) {
response.removeHeaders(hdr);
}
}
}
private boolean backendResponseMustNotHaveBody(final HttpRequest request, final HttpResponse backendResponse) {
return HeaderConstants.HEAD_METHOD.equals(request.getRequestLine().getMethod())
|| backendResponse.getStatusLine().getStatusCode() == HttpStatus.SC_NO_CONTENT
|| backendResponse.getStatusLine().getStatusCode() == HttpStatus.SC_RESET_CONTENT
|| backendResponse.getStatusLine().getStatusCode() == HttpStatus.SC_NOT_MODIFIED;
}
private void requestDidNotExpect100ContinueButResponseIsOne(final HttpRequestWrapper request,
final HttpResponse response) throws IOException {
if (response.getStatusLine().getStatusCode() != HttpStatus.SC_CONTINUE) {
return;
}
final HttpRequest originalRequest = request.getOriginal();
if (originalRequest instanceof HttpEntityEnclosingRequest) {
if (((HttpEntityEnclosingRequest)originalRequest).expectContinue()) {
return;
}
}
consumeBody(response);
throw new ClientProtocolException(UNEXPECTED_100_CONTINUE);
}
private void transferEncodingIsNotReturnedTo1_0Client(final HttpRequestWrapper request,
final HttpResponse response) {
final HttpRequest originalRequest = request.getOriginal();
if (originalRequest.getProtocolVersion().compareToVersion(HttpVersion.HTTP_1_1) >= 0) {
return;
}
removeResponseTransferEncoding(response);
}
private void removeResponseTransferEncoding(final HttpResponse response) {
response.removeHeaders("TE");
response.removeHeaders(HTTP.TRANSFER_ENCODING);
}
}