我正在访问一个将我重定向到包含空格的网址的网址。 （使用HttpClient 4.x）如何防止此错误（用％20替换空格而不是+）
08-06 02:45:56.486: WARN/System.err(655): org.apache.http.client.ClientProtocolException
08-06 02:45:56.493: WARN/System.err(655): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:557)
08-06 02:45:56.534: WARN/System.err(655): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:509)
08-06 02:45:56.603: WARN/System.err(655): at com.romcessed.romsearch.searchproviders.DopeRomsConnector$DownloadROMTask.doInBackground(DopeRomsConnector.java:636)
08-06 02:45:56.623: WARN/System.err(655): at com.romcessed.romsearch.searchproviders.DopeRomsConnector$DownloadROMTask.doInBackground(DopeRomsConnector.java:1)
08-06 02:45:56.643: WARN/System.err(655): at android.os.AsyncTask$2.call(AsyncTask.java:185)
08-06 02:45:56.663: WARN/System.err(655): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-06 02:45:56.683: WARN/System.err(655): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-06 02:45:56.693: WARN/System.err(655): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
08-06 02:45:56.713: WARN/System.err(655): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
08-06 02:45:56.713: WARN/System.err(655): at java.lang.Thread.run(Thread.java:1096)
08-06 02:45:56.743: WARN/System.err(655): Caused by: org.apache.http.ProtocolException: Invalid redirect URI: http://somewebsite.com/some file with spaces.zip
08-06 02:45:56.787: WARN/System.err(655): at org.apache.http.impl.client.DefaultRedirectHandler.getLocationURI(DefaultRedirectHandler.java:116)
08-06 02:45:56.803: WARN/System.err(655): at org.apache.http.impl.client.DefaultRequestDirector.handleResponse(DefaultRequestDirector.java:892)
08-06 02:45:56.813: WARN/System.err(655): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:457)
08-06 02:45:56.843: WARN/System.err(655): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
08-06 02:45:56.843: WARN/System.err(655): ... 9 more
08-06 02:45:56.873: WARN/System.err(655): Caused by: java.net.URISyntaxException: Illegal character in path at index #: http://somewebsite.com/some file with spaces.zip
08-06 02:45:56.913: WARN/System.err(655): at java.net.URI$Helper.validatePath(URI.java:448)
08-06 02:45:56.923: WARN/System.err(655): at java.net.URI$Helper.parseURI(URI.java:398)
08-06 02:45:56.953: WARN/System.err(655): at java.net.URI$Helper.access$100(URI.java:302)
08-06 02:45:56.963: WARN/System.err(655): at java.net.URI.<init>(URI.java:87)
08-06 02:45:56.993: WARN/System.err(655): at org.apache.http.impl.client.DefaultRedirectHandler.getLocationURI(DefaultRedirectHandler.java:114)
08-06 02:45:57.013: WARN/System.err(655): ... 12 more
答案 0 :(得分：16)
Apache HTTP库允许您注册RedirectHandler对象，该对象将在重定向发生时被调用。您可以使用它来拦截重定向并修复它。
（话虽如此，向您发送此重定向的网站已损坏。您应该与他们联系并告知他们。）
class CustomRedirectHandler extends DefaultRedirectHandler {
public URI getLocationURI(HttpResponse response, HttpContext context) {
// Extract the Location: header and manually convert spaces to %20's
// Return the corrected URI
}
}
DefaultHttpClient httpClient = new DefaultHttpClient();
RedirectHandler customRedirectHandler = new CustomRedirectHandler();
//...
httpClient.setRedirectHandler(customRedirectHandler);
答案 1 :(得分：11)
这是我的工作代码：）
class spaceRedirectHandler extends DefaultRedirectHandler{
private static final String REDIRECT_LOCATIONS = "http.protocol.redirect-locations";
public spaceRedirectHandler() {
super();
}
public boolean isRedirectRequested(
final HttpResponse response,
final HttpContext context) {
if (response == null) {
throw new IllegalArgumentException("HTTP response may not be null");
}
int statusCode = response.getStatusLine().getStatusCode();
switch (statusCode) {
case HttpStatus.SC_MOVED_TEMPORARILY:
case HttpStatus.SC_MOVED_PERMANENTLY:
case HttpStatus.SC_SEE_OTHER:
case HttpStatus.SC_TEMPORARY_REDIRECT:
return true;
default:
return false;
} //end of switch
}
public URI getLocationURI(
final HttpResponse response,
final HttpContext context) throws ProtocolException {
if (response == null) {
throw new IllegalArgumentException("HTTP response may not be null");
}
//get the location header to find out where to redirect to
Header locationHeader = response.getFirstHeader("location");
if (locationHeader == null) {
// got a redirect response, but no location header
throw new ProtocolException(
"Received redirect response " + response.getStatusLine()
+ " but no location header");
}
//HERE IS THE MODIFIED LINE OF CODE
String location = locationHeader.getValue().replaceAll (" ", "%20");
URI uri;
try {
uri = new URI(location);
} catch (URISyntaxException ex) {
throw new ProtocolException("Invalid redirect URI: " + location, ex);
}
HttpParams params = response.getParams();
// rfc2616 demands the location value be a complete URI
// Location = "Location" ":" absoluteURI
if (!uri.isAbsolute()) {
if (params.isParameterTrue(ClientPNames.REJECT_RELATIVE_REDIRECT)) {
throw new ProtocolException("Relative redirect location '"
+ uri + "' not allowed");
}
// Adjust location URI
HttpHost target = (HttpHost) context.getAttribute(
ExecutionContext.HTTP_TARGET_HOST);
if (target == null) {
throw new IllegalStateException("Target host not available " +
"in the HTTP context");
}
HttpRequest request = (HttpRequest) context.getAttribute(
ExecutionContext.HTTP_REQUEST);
try {
URI requestURI = new URI(request.getRequestLine().getUri());
URI absoluteRequestURI = URIUtils.rewriteURI(requestURI, target, true);
uri = URIUtils.resolve(absoluteRequestURI, uri);
} catch (URISyntaxException ex) {
throw new ProtocolException(ex.getMessage(), ex);
}
}
if (params.isParameterFalse(ClientPNames.ALLOW_CIRCULAR_REDIRECTS)) {
RedirectLocations redirectLocations = (RedirectLocations) context.getAttribute(
REDIRECT_LOCATIONS);
if (redirectLocations == null) {
redirectLocations = new RedirectLocations();
context.setAttribute(REDIRECT_LOCATIONS, redirectLocations);
}
URI redirectURI;
if (uri.getFragment() != null) {
try {
HttpHost target = new HttpHost(
uri.getHost(),
uri.getPort(),
uri.getScheme());
redirectURI = URIUtils.rewriteURI(uri, target, true);
} catch (URISyntaxException ex) {
throw new ProtocolException(ex.getMessage(), ex);
}
} else {
redirectURI = uri;
}
if (redirectLocations.contains(redirectURI)) {
throw new CircularRedirectException("Circular redirect to '" +
redirectURI + "'");
} else {
redirectLocations.add(redirectURI);
}
}
return uri;
}
}
答案 2 :(得分：3)
我建议您创建自定义重定向策略
class CustomRedirectStrategy extends DefaultRedirectStrategy {
// NOTE: Hack for bad redirects such as: http://www.healio.com/Rss/Allergy%20Immunology
override def createLocationURI(location: String): URI = {
try {
super.createLocationURI(location)
} catch {
case ex: ProtocolException =>
val url = new URL(location)
val uri = new URI(url.getProtocol, url.getUserInfo, url.getHost, url.getPort, url.getPath, url.getQuery, url.getRef)
uri
}
}
}
您可以通过setRedirectStrategy方法在客户端设置。
HttpAsyncClients.custom.setRedirectStrategy(new CustomRedirectStrategy).build
答案 3 :(得分：2)
另一个工作代码示例，它将使用％{20}替换空格，基于https://stackoverflow.com/a/8962879/956415
private download(){
...
mHttpClient = new DefaultHttpClient(httpParams);
mHttpClient.setRedirectHandler(new DefaultRedirectHandler() {
@Override
public boolean isRedirectRequested(HttpResponse httpResponse, HttpContext httpContext) {
return super.isRedirectRequested(httpResponse, httpContext);
}
@Override
public URI getLocationURI(HttpResponse httpResponse, HttpContext httpContext) throws ProtocolException {
return sanitizeUrl(httpResponse.getFirstHeader("location").getValue());
}
});
}
private URI sanitizeUrl(String sanitizeURL) throws ProtocolException {
URI uri = null;
try {
URL url = new URL(URLDecoder.decode(sanitizeURL, UTF_8));
// https://stackoverflow.com/a/8962879/956415
uri = new URI(url.getProtocol(), url.getUserInfo(), url.getHost(), url.getPort(), url.getPath(), url.getQuery(), url.getRef());
} catch (URISyntaxException | MalformedURLException | UnsupportedEncodingException e) {
throw new ProtocolException(e.getMessage(), e);
}
return uri;
}
答案 4 :(得分：1)
如果有人在2020年及以后寻求完整的解决方案，请参阅下文。扩展DefaultRedirectStrategy并覆盖创建重定向URI的方法，以将空格转换为%20序列。
public class CleanUrlRedirectStrategy extends DefaultRedirectStrategy
{
private static final Logger logger = LoggerFactory.getLogger( MethodHandles.lookup().lookupClass() );
// Clean spaces in redirect URLs to prevent an IOException
@Override
protected URI createLocationURI( final @NotNull String orig ) throws ProtocolException
{
// Replace spaces
Objects.requireNonNull( orig );
var fixed = orig.replaceAll("\\s","%20"); // Not \\s+
if ( ! orig.equals( fixed ) )
{
logger.debug( "Cleaned redirect URL from '{}' to '{}'", orig, fixed );
}
return super.createLocationURI( fixed );
}
}
和
var httpClient = HttpClientBuilder
.create()
.setRedirectStrategy( new CleanUrlRedirectStrategy() )
.build();
答案 5 :(得分：-1)