get response content

[inikonorov]

How can I get content of response in njs?

[xeioex]

@inikonorov

See the reference

r.responseBody
holds the subrequest response body, read-only. The size of r.responseBody is limited by the subrequest_output_buffer_size directive.

Please note that responseBody is available only for response request in a subrequest callback.

function content(r) {
     function callback(response) {
         // response.responseBody is available here;
     }

    r.subrequest('/foo', callback);
}

[inikonorov]

but this method works only for subrequest. but what should I do if I don't need to get response of subrequest? for example: I go on site and I want to get the response of this request (i.e. html code)

[drsm]

@inikonorov
there is no general purpose HTTP client yet.
but maybe #101 would help you as an example.

[inikonorov]

Thank you very much!

[maniLonkar]

@drsm @inikonorov How did you get the response body exactly? I am trying to log the response body in a file. This is my js file

function logger(r) {
    var time = r.variables.time_local;
    var method = r.method;
    var uri = r.uri;
    var status = r.status;
    var reqBody = r.requestBody || {};
    var args = r.args == undefined || r.args == null ? {} : r.args;
    var session = getSession(r.headersIn);
    var log = "";
    r.subrequest(uri, function(res) {
        r.log("respBody");
        r.log(res.responseBody);
        return JSON.stringify({
            "time": time,
            "method": method,
            "uri": uri,
            "status": status,
            "req_body": r.requestBody,
            "session": session,
            "resp_body": "res.responseBody",
        });
    });
}

I tried above but getting error 1 pending events while closing request

[drsm]

@maniLonkar
Hi!

Subrequests are asynchronous and you should end the main request manually when all or some of them are complete. The return value of r.subrequest makes no sense, as there nowhere to return.

function logger(r) {
    var time = r.variables.time_local;
    var method = r.method;
    var uri = r.uri;
    var status = r.status;
    var reqBody = r.requestBody || {};
    var args = r.args == undefined || r.args == null ? {} : r.args;
    var session = getSession(r.headersIn);
    var log = "";
    r.subrequest(uri, function(res) {
        r.log("respBody");
        r.log(res.responseBody);
        r.return(200, JSON.stringify({
            "time": time,
            "method": method,
            "uri": uri,
            "status": status,
            "req_body": r.requestBody,
            "session": session,
            "resp_body": "res.responseBody",
        });
    }));
}

[dmitry-j-mikhin]

I've managed to get full response body content using js_body_filter, that later can be used for logging, example is here - https://github.com/dmitry-j-mikhin/nginx-njs-log

[kalungedamaji]

@dmitry-j-mikhin It worked thanks