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30 package org.apache.commons.httpclient.params;
31
32 import org.apache.commons.httpclient.HttpVersion;
33 import org.apache.commons.httpclient.cookie.CookiePolicy;
34 import org.apache.commons.logging.Log;
35 import org.apache.commons.logging.LogFactory;
36
37 /***
38 * This class represents a collection of HTTP protocol parameters applicable to
39 * {@link org.apache.commons.httpclient.HttpMethod HTTP methods}. Protocol
40 * parameters may be linked together to form a hierarchy. If a particular
41 * parameter value has not been explicitly defined in the collection itself,
42 * its value will be drawn from the parent collection of parameters.
43 *
44 * @author <a href="mailto:oleg@ural.ru">Oleg Kalnichevski</a>
45 * @author Christian Kohlschuetter
46 *
47 * @version $Revision: 1.13 $
48 *
49 * @since 3.0
50 */
51 public class HttpMethodParams extends DefaultHttpParams {
52
53 /*** Log object for this class. */
54 private static final Log LOG = LogFactory.getLog(HttpMethodParams.class);
55
56 /***
57 * Defines the content of the <tt>User-Agent</tt> header used by
58 * {@link org.apache.commons.httpclient.HttpMethod HTTP methods}.
59 * <p>
60 * This parameter expects a value of type {@link String}.
61 * </p>
62 */
63 public static final String USER_AGENT = "http.useragent";
64
65 /***
66 * Defines the {@link HttpVersion HTTP protocol version} used by
67 * {@link org.apache.commons.httpclient.HttpMethod HTTP methods} per
68 * default.
69 * <p>
70 * This parameter expects a value of type {@link HttpVersion}.
71 * </p>
72 */
73 public static final String PROTOCOL_VERSION = "http.protocol.version";
74
75 /***
76 * Defines whether {@link org.apache.commons.httpclient.HttpMethod HTTP methods} should
77 * reject ambiguous {@link org.apache.commons.httpclient.StatusLine HTTP status line}.
78 * <p>
79 * This parameter expects a value of type {@link Boolean}.
80 * </p>
81 */
82 public static final String UNAMBIGUOUS_STATUS_LINE = "http.protocol.unambiguous-statusline";
83
84 /***
85 * Defines whether {@link org.apache.commons.httpclient.Cookie cookies} should be put on
86 * a single {@link org.apache.commons.httpclient.Header response header}.
87 * <p>
88 * This parameter expects a value of type {@link Boolean}.
89 * </p>
90 */
91 public static final String SINGLE_COOKIE_HEADER = "http.protocol.single-cookie-header";
92
93 /***
94 * Defines whether responses with an invalid <tt>Transfer-Encoding</tt> header should be
95 * rejected.
96 * <p>
97 * This parameter expects a value of type {@link Boolean}.
98 * </p>
99 */
100 public static final String STRICT_TRANSFER_ENCODING = "http.protocol.strict-transfer-encoding";
101
102 /***
103 * Defines whether the content body sent in response to
104 * {@link org.apache.commons.httpclient.methods.HeadMethod} should be rejected.
105 * <p>
106 * This parameter expects a value of type {@link Boolean}.
107 * </p>
108 */
109 public static final String REJECT_HEAD_BODY = "http.protocol.reject-head-body";
110
111 /***
112 * Sets period of time in milliseconds to wait for a content body sent in response to
113 * {@link org.apache.commons.httpclient.methods.HeadMethod HEAD method} from a
114 * non-compliant server. If the parameter is not set or set to <tt>-1</tt> non-compliant
115 * response body check is disabled.
116 * <p>
117 * This parameter expects a value of type {@link Integer}.
118 * </p>
119 */
120 public static final String HEAD_BODY_CHECK_TIMEOUT = "http.protocol.head-body-timeout";
121
122 /***
123 * <p>
124 * Activates 'Expect: 100-Continue' handshake for the
125 * {@link org.apache.commons.httpclient.methods.ExpectContinueMethod
126 * entity enclosing methods}. The purpose of the 'Expect: 100-Continue'
127 * handshake to allow a client that is sending a request message with
128 * a request body to determine if the origin server is willing to
129 * accept the request (based on the request headers) before the client
130 * sends the request body.
131 * </p>
132 *
133 * <p>
134 * The use of the 'Expect: 100-continue' handshake can result in
135 * noticable peformance improvement for entity enclosing requests
136 * (such as POST and PUT) that require the target server's
137 * authentication.
138 * </p>
139 *
140 * <p>
141 * 'Expect: 100-continue' handshake should be used with
142 * caution, as it may cause problems with HTTP servers and
143 * proxies that do not support HTTP/1.1 protocol.
144 * </p>
145 *
146 * This parameter expects a value of type {@link Boolean}.
147 */
148 public static final String USE_EXPECT_CONTINUE = "http.protocol.expect-continue";
149
150 /***
151 * Defines the charset to be used when encoding
152 * {@link org.apache.commons.httpclient.Credentials}. If not defined then the
153 * {@link #HTTP_ELEMENT_CHARSET} should be used.
154 * <p>
155 * This parameter expects a value of type {@link String}.
156 * </p>
157 */
158 public static final String CREDENTIAL_CHARSET = "http.protocol.credential-charset";
159
160 /***
161 * Defines the charset to be used for encoding HTTP protocol elements.
162 * <p>
163 * This parameter expects a value of type {@link String}.
164 * </p>
165 */
166 public static final String HTTP_ELEMENT_CHARSET = "http.protocol.element-charset";
167
168 /***
169 * Defines the charset to be used for encoding content body.
170 * <p>
171 * This parameter expects a value of type {@link String}.
172 * </p>
173 */
174 public static final String HTTP_CONTENT_CHARSET = "http.protocol.content-charset";
175
176 /***
177 * Defines {@link CookiePolicy cookie policy} to be used for cookie management.
178 * <p>
179 * This parameter expects a value of type {@link String}.
180 * </p>
181 */
182 public static final String COOKIE_POLICY = "http.protocol.cookie-policy";
183
184 /***
185 * Defines HttpClient's behavior when a response provides more bytes than
186 * expected (specified with Content-Length, for example).
187 * <p>
188 * Such surplus data makes the HTTP connection unreliable for keep-alive
189 * requests, as malicious response data (faked headers etc.) can lead to undesired
190 * results on the next request using that connection.
191 * </p>
192 * <p>
193 * If this parameter is set to <code>true</code>, any detection of extra
194 * input data will generate a warning in the log.
195 * </p>
196 * <p>
197 * This parameter expects a value of type {@link Boolean}.
198 * </p>
199 */
200 public static final String WARN_EXTRA_INPUT = "http.protocol.warn-extra-input";
201
202 /***
203 * Defines the maximum number of ignorable lines before we expect
204 * a HTTP response's status code.
205 * <p>
206 * With HTTP/1.1 persistent connections, the problem arises that
207 * broken scripts could return a wrong Content-Length
208 * (there are more bytes sent than specified).<br />
209 * Unfortunately, in some cases, this is not possible after the bad response,
210 * but only before the next one. <br />
211 * So, HttpClient must be able to skip those surplus lines this way.
212 * </p>
213 * <p>
214 * Set this to 0 to disallow any garbage/empty lines before the status line.<br />
215 * To specify no limit, use {@link java.lang.Integer#MAX_VALUE} (default in lenient mode).
216 * </p>
217 *
218 * This parameter expects a value of type {@link Integer}.
219 */
220 public static final String STATUS_LINE_GARBAGE_LIMIT = "http.protocol.status-line-garbage-limit";
221
222 /***
223 * Sets the socket timeout (<tt>SO_TIMEOUT</tt>) in milliseconds to be used when executing the method.
224 * A timeout value of zero is interpreted as an infinite timeout.
225 * <p>
226 * This parameter expects a value of type {@link Integer}.
227 * </p>
228 * @see java.net.SocketOptions#SO_TIMEOUT
229 */
230 public static final String SO_TIMEOUT = "http.socket.timeout";
231
232 /***
233 * Creates a new collection of parameters with the collection returned
234 * by {@link #getDefaultParams()} as a parent. The collection will defer
235 * to its parent for a default value if a particular parameter is not
236 * explicitly set in the collection itself.
237 *
238 * @see #getDefaultParams()
239 */
240 public HttpMethodParams() {
241 super(getDefaultParams());
242 }
243
244 /***
245 * Creates a new collection of parameters with the given parent.
246 * The collection will defer to its parent for a default value
247 * if a particular parameter is not explicitly set in the collection
248 * itself.
249 *
250 * @param defaults the parent collection to defer to, if a parameter
251 * is not explictly set in the collection itself.
252 *
253 * @see #getDefaultParams()
254 */
255 public HttpMethodParams(HttpParams defaults) {
256 super(defaults);
257 }
258
259 /***
260 * Returns the charset to be used for writing HTTP headers.
261 * @return The charset
262 */
263 public String getHttpElementCharset() {
264 String charset = (String) getParameter(HTTP_ELEMENT_CHARSET);
265 if (charset == null) {
266 LOG.warn("HTTP element charset not configured, using US-ASCII");
267 charset = "US-ASCII";
268 }
269 return charset;
270 }
271
272 /***
273 * Sets the charset to be used for writing HTTP headers.
274 * @param charset The charset
275 */
276 public void setHttpElementCharset(String charset) {
277 setParameter(HTTP_ELEMENT_CHARSET, charset);
278 }
279
280 /***
281 * Returns the default charset to be used for writing content body,
282 * when no charset explicitly specified.
283 * @return The charset
284 */
285 public String getContentCharset() {
286 String charset = (String) getParameter(HTTP_CONTENT_CHARSET);
287 if (charset == null) {
288 LOG.warn("Default content charset not configured, using ISO-8859-1");
289 charset = "ISO-8859-1";
290 }
291 return charset;
292 }
293
294 /***
295 * Sets the default charset to be used for writing content body,
296 * when no charset explicitly specified.
297 * @param charset The charset
298 */
299 public void setContentCharset(String charset) {
300 setParameter(HTTP_CONTENT_CHARSET, charset);
301 }
302
303 /***
304 * Returns the charset to be used for {@link org.apache.commons.httpclient.Credentials}. If
305 * not configured the {@link #HTTP_ELEMENT_CHARSET HTTP element charset} is used.
306 * @return The charset
307 */
308 public String getCredentialCharset() {
309 String charset = (String) getParameter(CREDENTIAL_CHARSET);
310 if (charset == null) {
311 LOG.debug("Credential charset not configured, using HTTP element charset");
312 charset = getHttpElementCharset();
313 }
314 return charset;
315 }
316
317 /***
318 * Sets the charset to be used for writing HTTP headers.
319 * @param charset The charset
320 */
321 public void setCredentialCharset(String charset) {
322 setParameter(CREDENTIAL_CHARSET, charset);
323 }
324
325 /***
326 * Returns {@link HttpVersion HTTP protocol version} to be used by the
327 * {@link org.apache.commons.httpclient.HttpMethod HTTP methods} that
328 * this collection of parameters applies to.
329 *
330 * @return {@link HttpVersion HTTP protocol version}
331 */
332 public HttpVersion getVersion() {
333 Object param = getParameter(PROTOCOL_VERSION);
334 if (param == null) {
335 return HttpVersion.HTTP_1_1;
336 }
337 return (HttpVersion)param;
338 }
339
340 /***
341 * Assigns the {@link HttpVersion HTTP protocol version} to be used by the
342 * {@link org.apache.commons.httpclient.HttpMethod HTTP methods} that
343 * this collection of parameters applies to.
344 *
345 * @param version the {@link HttpVersion HTTP protocol version}
346 */
347 public void setVersion(HttpVersion version) {
348 setParameter(PROTOCOL_VERSION, version);
349 }
350
351
352 /***
353 * Returns {@link CookiePolicy cookie policy} to be used by the
354 * {@link org.apache.commons.httpclient.HttpMethod HTTP methods}
355 * this collection of parameters applies to.
356 *
357 * @return {@link CookiePolicy cookie policy}
358 */
359 public String getCookiePolicy() {
360 Object param = getParameter(COOKIE_POLICY);
361 if (param == null) {
362 return CookiePolicy.DEFAULT;
363 }
364 return (String)param;
365 }
366
367 /***
368 * Assigns the {@link CookiePolicy cookie policy} to be used by the
369 * {@link org.apache.commons.httpclient.HttpMethod HTTP methods}
370 * this collection of parameters applies to.
371 *
372 * @param policy the {@link CookiePolicy cookie policy}
373 */
374 public void setCookiePolicy(String policy) {
375 setParameter(COOKIE_POLICY, policy);
376 }
377
378 /***
379 * Returns the default socket timeout (<tt>SO_TIMEOUT</tt>) in milliseconds which is the
380 * timeout for waiting for data. A timeout value of zero is interpreted as an infinite
381 * timeout.
382 *
383 * @return timeout in milliseconds
384 */
385 public int getSoTimeout() {
386 return getIntParameter(SO_TIMEOUT, 0);
387 }
388
389 /***
390 * Sets the default socket timeout (<tt>SO_TIMEOUT</tt>) in milliseconds which is the
391 * timeout for waiting for data. A timeout value of zero is interpreted as an infinite
392 * timeout.
393 *
394 * @param timeout Timeout in milliseconds
395 */
396 public void setSoTimeout(int timeout) {
397 setIntParameter(SO_TIMEOUT, timeout);
398 }
399
400 private static final String[] PROTOCOL_STRICTNESS_PARAMETERS = {
401 UNAMBIGUOUS_STATUS_LINE,
402 SINGLE_COOKIE_HEADER,
403 STRICT_TRANSFER_ENCODING,
404 REJECT_HEAD_BODY,
405 WARN_EXTRA_INPUT
406 };
407
408 /***
409 * Makes the {@link org.apache.commons.httpclient.HttpMethod HTTP methods}
410 * strictly follow the HTTP protocol specification (RFC 2616 and other relevant RFCs).
411 * It must be noted that popular HTTP agents have different degree of HTTP protocol
412 * compliance and some HTTP serves are programmed to expect the behaviour that does not
413 * strictly adhere to the HTTP specification.
414 */
415 public void makeStrict() {
416 setParameters(PROTOCOL_STRICTNESS_PARAMETERS, new Boolean(true));
417 setIntParameter(STATUS_LINE_GARBAGE_LIMIT, 0);
418 }
419
420 /***
421 * Makes the {@link org.apache.commons.httpclient.HttpMethod HTTP methods}
422 * attempt to mimic the exact behaviour of commonly used HTTP agents,
423 * which many HTTP servers expect, even though such behaviour may violate
424 * the HTTP protocol specification (RFC 2616 and other relevant RFCs).
425 */
426 public void makeLenient() {
427 setParameters(PROTOCOL_STRICTNESS_PARAMETERS, new Boolean(false));
428 setIntParameter(STATUS_LINE_GARBAGE_LIMIT, Integer.MAX_VALUE);
429 }
430
431 }