javascript - How to retrieve detail of HTTP response error - Stack Overflow

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I've got a node.js application that is making some https requests to a ReST web service. I want to do something that, on the face of it, appears like it should be simple - retrieve the error message that es back from the web service.

I can get hold of the status code - i.e. 200, 404 etc but not the detail of the error.

The body of the response looks like this:

{
    "type": ".html#sec10.4.5",
    "title" : "Not Found",
    "status": "404",
    "detail": "Resource not found: X33003"
}

My code looks like this:

var options = {
    "method": "POST",
    "hostname": "myhost",
    "port": null,
    "path": "/mypath/",
    "headers": {
        "content-type": "application/json",
        "authorization": basicAuthString,
        "cache-control": "no-cache"
    }
};

try {
     var reqWorkSkill = http.request(options, function(res) {
     var chunks = [];
     res.on("data", function(chunk) {
         chunks.push(chunk);
     });
     res.on("end", function() {
         var body = Buffer.concat(chunks);             
         var response = JSON.parse(body);
         console.log("Detail: " + body.detail);  // COMES BACK UNDEFINED
     });
     res.on("error", function(error) {         
         console.log("Something went wrong with: " + resourceIdArray[i] + " failed: " + error);
     });
     if(res.statusCode != 200){
         // Do some stuff
     }
     console.log("res status: " + res.statusCode);
     console.log("res text: " + res.statusText); // COMES BACK UNDEFINED

    });
    reqWorkSkill.write(itemToPost);                       
    reqWorkSkill.end();
} 
catch (e) {
    console.log(e);
}

It would be useful to be able to present what exactly went wrong - i.e the message: Resource not found: X33003 from the JSON above. How can I get hold of that?

I've got a node.js application that is making some https requests to a ReST web service. I want to do something that, on the face of it, appears like it should be simple - retrieve the error message that es back from the web service.

I can get hold of the status code - i.e. 200, 404 etc but not the detail of the error.

The body of the response looks like this:

{
    "type": "http://www.w3/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.5",
    "title" : "Not Found",
    "status": "404",
    "detail": "Resource not found: X33003"
}

My code looks like this:

var options = {
    "method": "POST",
    "hostname": "myhost.",
    "port": null,
    "path": "/mypath/",
    "headers": {
        "content-type": "application/json",
        "authorization": basicAuthString,
        "cache-control": "no-cache"
    }
};

try {
     var reqWorkSkill = http.request(options, function(res) {
     var chunks = [];
     res.on("data", function(chunk) {
         chunks.push(chunk);
     });
     res.on("end", function() {
         var body = Buffer.concat(chunks);             
         var response = JSON.parse(body);
         console.log("Detail: " + body.detail);  // COMES BACK UNDEFINED
     });
     res.on("error", function(error) {         
         console.log("Something went wrong with: " + resourceIdArray[i] + " failed: " + error);
     });
     if(res.statusCode != 200){
         // Do some stuff
     }
     console.log("res status: " + res.statusCode);
     console.log("res text: " + res.statusText); // COMES BACK UNDEFINED

    });
    reqWorkSkill.write(itemToPost);                       
    reqWorkSkill.end();
} 
catch (e) {
    console.log(e);
}

It would be useful to be able to present what exactly went wrong - i.e the message: Resource not found: X33003 from the JSON above. How can I get hold of that?

• javascript
• node.js
• httprequest

Share Improve this question Follow edited Aug 23, 2017 at 5:26 Ross Coundon asked Aug 22, 2017 at 21:03 Ross CoundonRoss Coundon 92711 gold badge1212 silver badges2020 bronze badges 2

• Can we see the options object? Also, are you expecting binary data? – ishegg Commented Aug 22, 2017 at 21:18
• Hi ishegg - Updated to include the Options object. The data returned isn't binary, there's either nothing returned with status of 200 or, I think, a body containing the JSON I included. – Ross Coundon Commented Aug 23, 2017 at 5:28

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1 Answer 1

Sorted by: Reset to default 3

You just had the wrong properties of the objects you were calling. First, you were calling body.detail, but body was the Buffer representation. You need to call the detail property on response. Second, you were trying to get the statusTextproperty of the response, but the correct property is statusMessage. Code ends up like this:

var options = {
    "method": "POST",
    "hostname": "myhost.",
    "port": null,
    "path": "/mypath/",
    "headers": {
        "content-type": "application/json",
        "authorization": basicAuthString,
        "cache-control": "no-cache"
    }
};

try {
     var reqWorkSkill = http.request(options, function(res) {
     var chunks = [];
     res.on("data", function(chunk) {
         chunks.push(chunk);
     });
     res.on("end", function() {
         var body = Buffer.concat(chunks);             
         var response = JSON.parse(body);
         console.log("Detail: " + response.detail);  // response, not body
     });
     res.on("error", function(error) {         
         console.log("Something went wrong with: " + resourceIdArray[i] + " failed: " + error);
     });
     if(res.statusCode != 200){
         // Do some stuff
     }
     console.log("res status: " + res.statusCode);
     console.log("res text: " + res.statusMessage); // statusMessage, not statusText

    });
    reqWorkSkill.write(itemToPost);                       
    reqWorkSkill.end();
} 
catch (e) {
    console.log(e);
}

It's always a good idea to console.log (or the equivalent) the object you're trying to access if you're not getting the correct results, that will show you all the properties of the object.

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