Node.js: use request module receive error bytes in http response [duplicate]

Question

I'm using nodejs to send http request to a server, and get http response from it(the http response body is encrypted, while the http header is normal). The response body will be written to a file. But I find the response body is different from what the server sent.

This is what I've done:

request.post({
    headers: {'content-type':'application/json'},
        url:'url-to-server',
        body:data-to-send
    }, function(error, response, body){         
    if(!error && response.statusCode==200){
        fs.writeFile(path-to-file,body,function(err){
        });
    }
});

The problem is, some byte values are replaced by ef bf bd

Server Send:   
    f5 cb b6 48 77 b6 26 6a d2 4c d8 d9 ...
Received data: 
    ef bf bd cb b6 48 77 ef bf bd 26 6a ...

Any ideas?

Thank you for the reply. I've already done it, it just displayed messy code, because the http response body is encrypted. — Sunson
– Sunson, Commented Jul 5, 2017 at 7:26
you are calling a api using request , is this api same response when you call this from anyother source like postman or something else — Shekhar Tyagi
– Shekhar Tyagi, Commented Jul 5, 2017 at 7:34
can please try this once fs.writeFile(path-to-file,body, 'utf8', function(err, contents) { console.log(contents); }); — Syed Ayesha Bebe
– Syed Ayesha Bebe, Commented Jul 5, 2017 at 7:41

k0pernikus · Accepted Answer · 2017-07-05 08:57:49Z

1

I've found that ef bf bd occurs when it tries to use utf-8 encoding. So I want to recieve raw data without encoding.

And I found this question about getting binary content, according to this link, i add encoding:null in my code, see below:

    request.post({
        headers: {'content-type':'application/json'},
        url:'url-to-server',
        encoding:null,
        body:data-to-send
    }, function(error, response, body){         
        if(!error && response.statusCode==200){
            fs.writeFile(path-to-file,body,function(err){
            });
        }
    });

And now the received data is correct.

edited Jul 5, 2017 at 8:57

k0pernikus

67.6k79 gold badges245 silver badges366 bronze badges

answered Jul 5, 2017 at 8:48

Sunson

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