Example usage for org.apache.http.client CircularRedirectException CircularRedirectException

Introduction

In this page you can find the example usage for org.apache.http.client CircularRedirectException CircularRedirectException.

Prototype

public CircularRedirectException(final String message) 

Source Link

Document

Creates a new CircularRedirectException with the specified detail message.

Usage

From source file:org.apache.nutch.protocol.httpclient.HttpClientRedirectStrategy.java

public URI getLocationURI(final HttpRequest request, final HttpResponse response, final HttpContext context)
        throws ProtocolException {
    if (request == null) {
        throw new IllegalArgumentException("HTTP request may not be null");
    }//from  w  w w.  jav a  2s.  co m
    if (response == null) {
        throw new IllegalArgumentException("HTTP response may not be null");
    }
    if (context == null) {
        throw new IllegalArgumentException("HTTP context 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");
    }
    String location = locationHeader.getValue();
    if (this.log.isDebugEnabled()) {
        this.log.debug("Redirect requested to location '" + location + "'");
    }

    URI uri = createLocationURI(location);

    HttpParams params = request.getParams();
    // rfc2616 demands the location value be a complete URI
    // Location       = "Location" ":" absoluteURI
    try {
        // Drop fragment
        uri = URIUtils.rewriteURI(uri);
        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");
            }
            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);
    }

    RedirectLocations redirectLocations = (RedirectLocations) context.getAttribute(REDIRECT_LOCATIONS);
    if (redirectLocations == null) {
        redirectLocations = new RedirectLocations();
        context.setAttribute(REDIRECT_LOCATIONS, redirectLocations);
    }
    if (params.isParameterFalse(ClientPNames.ALLOW_CIRCULAR_REDIRECTS)) {
        if (redirectLocations.contains(uri)) {
            throw new CircularRedirectException("Circular redirect to '" + uri + "'");
        }
    }
    redirectLocations.add(uri);
    return uri;
}

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