void DocumentThreadableLoader::redirectReceived(CachedResource* resource, ResourceRequest& request, const ResourceResponse& redirectResponse)
{
    ASSERT(m_client);
    ASSERT_UNUSED(resource, resource == m_resource);

    RefPtr<DocumentThreadableLoader> protect(this);
    // Allow same origin requests to continue after allowing clients to audit the redirect.
    if (isAllowedRedirect(request.url())) {
        if (m_client->isDocumentThreadableLoaderClient())
            static_cast<DocumentThreadableLoaderClient*>(m_client)->willSendRequest(request, redirectResponse);
        return;
    }

    // When using access control, only simple cross origin requests are allowed to redirect. The new request URL must have a supported
    // scheme and not contain the userinfo production. In addition, the redirect response must pass the access control check.
    if (m_options.crossOriginRequestPolicy == UseAccessControl) {
        bool allowRedirect = false;
        if (m_simpleRequest) {
            String accessControlErrorDescription;
            allowRedirect = SchemeRegistry::shouldTreatURLSchemeAsCORSEnabled(request.url().protocol())
                            && request.url().user().isEmpty()
                            && request.url().pass().isEmpty()
                            && passesAccessControlCheck(redirectResponse, m_options.allowCredentials, securityOrigin(), accessControlErrorDescription);
        }

        if (allowRedirect) {
            if (m_resource)
                clearResource();

            RefPtr<SecurityOrigin> originalOrigin = SecurityOrigin::createFromString(redirectResponse.url());
            RefPtr<SecurityOrigin> requestOrigin = SecurityOrigin::createFromString(request.url());
            // If the request URL origin is not same origin with the original URL origin, set source origin to a globally unique identifier.
            if (!originalOrigin->isSameSchemeHostPort(requestOrigin.get()))
                m_options.securityOrigin = SecurityOrigin::createUnique();
            // Force any subsequent requests to use these checks.
            m_sameOriginRequest = false;

            // Remove any headers that may have been added by the network layer that cause access control to fail.
            request.clearHTTPContentType();
            request.clearHTTPReferrer();
            request.clearHTTPOrigin();
            request.clearHTTPUserAgent();
            request.clearHTTPAccept();
            makeCrossOriginAccessRequest(request);
            return;
        }
    }

    m_client->didFailRedirectCheck();
    request = ResourceRequest();
}
void DocumentThreadableLoader::redirectReceived(Resource* resource, ResourceRequest& request, const ResourceResponse& redirectResponse)
{
    ASSERT(m_client);
    ASSERT_UNUSED(resource, resource == this->resource());

    RefPtr<DocumentThreadableLoader> protect(this);
    if (!isAllowedByPolicy(request.url())) {
        m_client->didFailRedirectCheck();
        request = ResourceRequest();
        return;
    }

    // Allow same origin requests to continue after allowing clients to audit the redirect.
    if (isAllowedRedirect(request.url())) {
        if (m_client->isDocumentThreadableLoaderClient())
            static_cast<DocumentThreadableLoaderClient*>(m_client)->willSendRequest(request, redirectResponse);
        return;
    }

    // When using access control, only simple cross origin requests are allowed to redirect. The new request URL must have a supported
    // scheme and not contain the userinfo production. In addition, the redirect response must pass the access control check if the
    // original request was not same-origin.
    if (m_options.crossOriginRequestPolicy == UseAccessControl) {

        InspectorInstrumentation::didReceiveCORSRedirectResponse(m_document->frame(), resource->identifier(), m_document->frame()->loader().documentLoader(), redirectResponse, 0);

        bool allowRedirect = false;
        String accessControlErrorDescription;

        if (m_simpleRequest) {
            allowRedirect = CrossOriginAccessControl::isLegalRedirectLocation(request.url(), accessControlErrorDescription)
                            && (m_sameOriginRequest || passesAccessControlCheck(redirectResponse, m_options.allowCredentials, securityOrigin(), accessControlErrorDescription));
        } else {
            accessControlErrorDescription = "The request was redirected to '"+ request.url().string() + "', which is disallowed for cross-origin requests that require preflight.";
        }

        if (allowRedirect) {
            // FIXME: consider combining this with CORS redirect handling performed by
            // CrossOriginAccessControl::handleRedirect().
            clearResource();

            RefPtr<SecurityOrigin> originalOrigin = SecurityOrigin::create(redirectResponse.url());
            RefPtr<SecurityOrigin> requestOrigin = SecurityOrigin::create(request.url());
            // If the original request wasn't same-origin, then if the request URL origin is not same origin with the original URL origin,
            // set the source origin to a globally unique identifier. (If the original request was same-origin, the origin of the new request
            // should be the original URL origin.)
            if (!m_sameOriginRequest && !originalOrigin->isSameSchemeHostPort(requestOrigin.get()))
                m_options.securityOrigin = SecurityOrigin::createUnique();
            // Force any subsequent requests to use these checks.
            m_sameOriginRequest = false;

            // Since the request is no longer same-origin, if the user didn't request credentials in
            // the first place, update our state so we neither request them nor expect they must be allowed.
            if (m_options.credentialsRequested == ClientDidNotRequestCredentials)
                m_options.allowCredentials = DoNotAllowStoredCredentials;

            // Remove any headers that may have been added by the network layer that cause access control to fail.
            request.clearHTTPContentType();
            request.clearHTTPReferrer();
            request.clearHTTPOrigin();
            request.clearHTTPUserAgent();
            request.clearHTTPAccept();
            makeCrossOriginAccessRequest(request);
            return;
        }

        ResourceError error(errorDomainBlinkInternal, 0, redirectResponse.url().string(), accessControlErrorDescription);
        m_client->didFailAccessControlCheck(error);
    } else {
        m_client->didFailRedirectCheck();
    }
    request = ResourceRequest();
}