httpclient

类HttpMethodBase  

protected void readStatusLine(HttpState state, HttpConnection conn)
    throws IOException, HttpException {
        LOG.trace("enter HttpMethodBase.readStatusLine(HttpState, HttpConnection)");

        final int maxGarbageLines = getParams().
            getIntParameter(HttpMethodParams.STATUS_LINE_GARBAGE_LIMIT, Integer.MAX_VALUE);

        //read out the HTTP status string
        int count = 0;
        String s;
        do {
         //
            s = conn.readLine(getParams().getHttpElementCharset());
           
            if (s == null && count == 0) {
                // The server just dropped connection on us
                throw new NoHttpResponseException("The server " + conn.getHost() +
                    " failed to respond");
            }
            if (Wire.HEADER_WIRE.enabled()) {
                Wire.HEADER_WIRE.input(s + "\r\n");
            }
            if (s != null && StatusLine.startsWithHTTP(s)) {
                // Got one
                break;
            } else if (s == null || count >= maxGarbageLines) {
                // Giving up
                throw new ProtocolException("The server " + conn.getHost() +
                        " failed to respond with a valid HTTP response");
            }
            count++;
        } while(true);

        //create the status line from the status string
        statusLine = new StatusLine(s);

        //check for a valid HTTP-Version
        String versionStr = statusLine.getHttpVersion();
        if (getParams().isParameterFalse(HttpMethodParams.UNAMBIGUOUS_STATUS_LINE)
           && versionStr.equals("HTTP")) {
            getParams().setVersion(HttpVersion.HTTP_1_0);
            if (LOG.isWarnEnabled()) {
                LOG.warn("Ambiguous status line (HTTP protocol version missing):" +
                statusLine.toString());
            }
        } else {
            this.effectiveVersion = HttpVersion.parse(versionStr);
        }

    }