C++ HttpHeader::resourceUnavailable方法代码示例

//.........这里部分代码省略.........
            return receiveResponseAndDataResult;
        }
        previousResponseReceived = true;
        requestHasAlreadyBeenRepeated = false;

        m_authorizationDriver.authorized(
            // authorization information is reset in case connection is to be closed
            !needCloseConnection
            // authorization success in case file received or successful redirect
            && (httpHeader.isFile()
                 || httpHeader.redirectRequired()
                 || httpHeader.fileNotFound()));

        if(httpHeader.isFile())
        {
            // in case proxy server by some ocassion desided to close
            //  connection after successful file receive event
            if(needCloseConnection)
                m_authorizationDriver.resetNtlmState();

            return CORE_NO_ERROR;
        }

        authorizationTarget = httpHeader.authorizationTarget();
		authorizationWasNeededOnProxy = !proxyAuthorizationHeader.empty();
        lastHttpCode = httpHeader.httpCode();

        // authorization error
        if(httpHeader.authorizationNeeded())
        {
            authorizationWasNeededOnProxy = (authorizationTarget == DownloadProgress::proxyServer);
            if(!switchAuthorization(fileName, relativeUrlPath, httpHeader.authorizationTarget(), proxyAddress,
                authorizationTypeSwitched, ntlmAuthorizationTriedAlready))
            {
                return httpHeader.convertHttpCodeToUpdaterCode();
            }
        }
        // redirect needed
        else if(httpHeader.redirectRequired())
        {
            // protection against infinite loop (according to RFC 2616)
            if(++infiniteRedirectLoop > 2)
            {
                TRACE_MESSAGE2("Infinite redirection loop detected for location '%S'",
                    httpHeader.m_location.toWideChar());
                return CORE_NO_SOURCE_FILE;
            }

            if(httpHeader.m_location.isAbsoluteUri())
                serverAddress.parse(httpHeader.m_location);
            else
            {
                serverAddress.parse(toProtocolPrefix(serverAddress.m_protocol) + serverAddress.m_hostname
                    + serverAddress.m_path + httpHeader.m_location);
                serverAddress.m_path.correctPathDelimiters();
            }

            fileName = serverAddress.m_fileName;
            relativeUrlPath.erase();

            TRACE_MESSAGE3("HTTP Redirect to file '%S' on server %S",
                fileName.toWideChar(), serverAddress.toString().toWideChar());
        }
        // known HTTP results
        else if(httpHeader.resourceUnavailable()
            || httpHeader.fileNotFound())
        {
            return httpHeader.convertHttpCodeToUpdaterCode();
        }
        // retry authorization with other credentials in case Forbidden
         // code received after successful authorization has happened
        else if(httpHeader.retryAuthorization(authorizationWasNeededOnProxy)
            && treat_403_502_httpCodesAs407())
        {
            if(!switchAuthorization(fileName, relativeUrlPath, DownloadProgress::proxyServer,
                proxyAddress, authorizationTypeSwitched, ntlmAuthorizationTriedAlready))
            {
                TRACE_MESSAGE2("Authorization was needed, but error HTTP code '%d' received and switch to next authorization type failed",
                    httpHeader.httpCode());
                return httpHeader.convertHttpCodeToUpdaterCode();
            }
            TRACE_MESSAGE3("Authorization was needed, but error HTTP code '%d' received, try next authorization type '%S'",
                httpHeader.httpCode(),
                toString(m_authorizationDriver.currentAuthorizationType()).toWideChar());
        }
        else
        {
            // processing HTTP code is not implemented
            m_authorizationDriver.resetAuthorizatoinState(proxyAuthorizationMethods);
            return httpHeader.convertHttpCodeToUpdaterCode();
        }
    }

    // Authorization state machine is complex and may contain bug,
     //  that is why protection against infinite loop is implemented
    TRACE_MESSAGE3("Error in HTTP authorization state implementation: credentials '%S', current authorization type '%S'",
        m_authorizationDriver.credentials().toString().toWideChar(),
        toString(m_authorizationDriver.currentAuthorizationType()).toWideChar());
    return CORE_DOWNLOAD_ERROR;
}