zuul修改request query param

SimpleHostRoutingFilter

@Override
    public Object run() {
        RequestContext context = RequestContext.getCurrentContext();
        HttpServletRequest request = context.getRequest();
        MultiValueMap<String, String> headers = this.helper
                .buildZuulRequestHeaders(request);
        MultiValueMap<String, String> params = this.helper
                .buildZuulRequestQueryParams(request);
        String verb = getVerb(request);
        InputStream requestEntity = getRequestBody(request);
        if (request.getContentLength() < 0) {
            context.setChunkedRequestBody();
        }

        String uri = this.helper.buildZuulRequestURI(request);
        this.helper.addIgnoredHeaders();

        try {
            HttpResponse response = forward(this.httpClient, verb, uri, request, headers,
                    params, requestEntity);
            setResponse(response);
        }
        catch (Exception ex) {
            context.set(ERROR_STATUS_CODE, HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            context.set("error.exception", ex);
        }
        return null;
    }

重點關注

MultiValueMap<String, String> params = this.helper
                .buildZuulRequestQueryParams(request);

在ProxyRequestHelper類裏頭

public MultiValueMap<String, String> buildZuulRequestQueryParams(
            HttpServletRequest request) {
        Map<String, List<String>> map = HTTPRequestUtils.getInstance().getQueryParams();
        MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
        if (map == null) {
            return params;
        }
        for (String key : map.keySet()) {
            for (String value : map.get(key)) {
                params.add(key, value);
            }
        }
        return params;
    }

再看com/netflix/zuul/util/HTTPRequestUtils.java

public Map<String, List<String>> getQueryParams() {

        Map<String, List<String>> qp = RequestContext.getCurrentContext().getRequestQueryParams();
        if (qp != null) return qp;

        HttpServletRequest request = RequestContext.getCurrentContext().getRequest();

        qp = new HashMap<String, List<String>>();

        if (request.getQueryString() == null) return null;
        StringTokenizer st = new StringTokenizer(request.getQueryString(), "&");
        int i;

        while (st.hasMoreTokens()) {
            String s = st.nextToken();
            i = s.indexOf("=");
            if (i > 0 && s.length() >= i + 1) {
                String name = s.substring(0, i);
                String value = s.substring(i + 1);

                try {
                    name = URLDecoder.decode(name, "UTF-8");
                } catch (Exception e) {
                }
                try {
                    value = URLDecoder.decode(value, "UTF-8");
                } catch (Exception e) {
                }

                List<String> valueList = qp.get(name);
                if (valueList == null) {
                    valueList = new LinkedList<String>();
                    qp.put(name, valueList);
                }

                valueList.add(value);
            }
            else if (i == -1)
            {
                String name=s;
                String value="";
                try {
                    name = URLDecoder.decode(name, "UTF-8");
                } catch (Exception e) {
                }
               
                List<String> valueList = qp.get(name);
                if (valueList == null) {
                    valueList = new LinkedList<String>();
                    qp.put(name, valueList);
                }

                valueList.add(value);
                
            }
        }

        RequestContext.getCurrentContext().setRequestQueryParams(qp);
        return qp;
    }

這裏優先取了RequestContext.getCurrentContext().getRequestQueryParams();
所以，對於url路由的服務來講，能夠修改context的queryParam來達到修改請求參數的目的。

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