How to get response message Error using WebResponse?

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Posted on by Kreatif

str         url, valueStr, json, jsonString, message;
Array       jsonArray;
Map         dataMap;
MapIterator mi;
Container   conData;

System.Net.HttpWebRequest       request;
System.Net.HttpWebResponse      response;
System.Byte[]                   byteArray;
System.IO.Stream                dataStream;
System.IO.StreamReader          streamRead;
System.Text.Encoding            utf8;
System.Exception                ex;

CLRObject                       clrObj;
Newtonsoft.Json.Linq.JObject    object;

System.Net.WebHeaderCollection  headers = new System.Net.WebHeaderCollection();

object = new Newtonsoft.Json.Linq.JObject();
object.Add("PortId", _port);
object.Add("PortName", _portName);

json    = Newtonsoft.Json.JsonConvert::SerializeObject(object);

url     = strFmt("%1", #longURL);
clrObj  = System.Net.WebRequest::Create(url);

request = clrObj;
request.Headers = headers;

utf8        = System.Text.Encoding::get_UTF8();
byteArray   = utf8.GetBytes(json);
request.set_Method("POST");
request.set_KeepAlive(true);
request.ContentType = "application/json";
request.set_ContentLength(byteArray.Length);

dataStream  = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.get_Length());

try
{
	response    = request.GetResponse();

	if(response.StatusCode == System.Net.HttpStatusCode::OK)
	{
		dataStream  = response.GetResponseStream();
		streamRead  = new System.IO.StreamReader(dataStream);
		jsonString  = streamRead.ReadToEnd();
		message     = KREGlobal::parseJsonVMS(jsonString);
		info(strFmt("%1", message));
	}
	else
	{
		info Error(strFmt("Error 1 -> %1", message));
	}
}
catch
{
	info Error(strFmt("Error 2 -> %1", message));
}

dataStream.Close();
response.Close();

Hi all,

i want to get response from API if my request data not OK.

i try like this code for get info error, but i can't get info error if request data not OK.

can you help me? Thanks.

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Answers (1)

Martin Dráb 237,795 Most Valuable Professional on at

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What kind of problem do you have with it? I see that your code isn't even trying to do that.

I think you should catch System.Net.WebException and then access its Response property.

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Sergei Minozhenko 23,093 on at

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Hi,

Probably you can use StatusDescription property (docs.microsoft.com/.../system.net.httpwebresponse.statusdescription

For catch statement check CLRException (docs.microsoft.com/.../how-to-catch-exceptions-thrown-from-clr-objects)

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Kreatif 10 on at

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Thanks Martin Drab,

i want to get error if data not valid in API.

if i user postMan, i can get error message in body with status 400 Bad Request.

but, if i try use my code, i can't get message error based on my script.

try { response = request.GetResponse(); if(response.StatusCode == System.Net.HttpStatusCode::OK) { dataStream = response.GetResponseStream(); streamRead = new System.IO.StreamReader(dataStream); jsonString = streamRead.ReadToEnd(); message = KREGlobal::parseJsonVMS(jsonString); info(strFmt("%1", message)); } else { throw Error(strFmt("Error 1 -> %1", message)); } } catch { throw Error(strFmt("Error 2 -> %1", message)); }

error automatic show message "The remote server returned an error: (400) Bad Request." info Error 1 or Error 2 not show.

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Kreatif 10 on at

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Thanks Sergei Minozhenko,

i just want to show my error if API not valid.

because if data valid, i can get info use condition :

if(response.StatusCode == System.Net.HttpStatusCode::OK)

{

////

}

but if data not valid or statusCode not OK (200), i can't get info error based on my script.

if(response.StatusCode == System.Net.HttpStatusCode::OK)

{

////

}

else

{

throw Error(strFmt("Error 1 -> %1", message));

}

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Martin Dráb 237,795 Most Valuable Professional on at

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It seems that you didn't get my suggestion, so let me show you an example of what I meant:

F&O has a much better way for catching CLR exceptions than what's covered in the documentation page for AX 2012. Take a look: System.Net.WebException webException; try { ... } catch (webException) { // Here you can access things like webException.Response.StatusCode }

Please use the debugger to see what exactly is going on in your code. You handle both exceptions and non-OK statuses in the same way, therefore you can't know which situation occurred.

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Kreatif 10 on at

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Thanks Martin,

actually my script like this.

System.Net.WebHeaderCollection headers = new System.Net.WebHeaderCollection(); object = new Newtonsoft.Json.Linq.JObject(); object.Add("PortId", _port); object.Add("PortName", _portName); json = Newtonsoft.Json.JsonConvert::SerializeObject(object); url = strFmt("%1", #longURL); clrObj = System.Net.WebRequest::Create(url); request = clrObj; request.Headers = headers; utf8 = System.Text.Encoding::get_UTF8(); byteArray = utf8.GetBytes(json); request.set_Method("POST"); request.set_KeepAlive(true); request.ContentType = "application/json"; request.set_ContentLength(byteArray.Length); dataStream = request.GetRequestStream(); dataStream.Write(byteArray, 0, byteArray.get_Length()); response = request.GetResponse(); if(response.StatusCode == System.Net.HttpStatusCode::OK) { dataStream = response.GetResponseStream(); streamRead = new System.IO.StreamReader(dataStream); jsonString = streamRead.ReadToEnd(); message = KREGlobal::parseJsonVMS(jsonString); info(strFmt("%1", message)); } else { info(strFmt("Error 1 -> %1", message)); } dataStream.Close(); response.Close();

Just one exception.

and if i debug if data not valid, my code stop in.

response = request.GetResponse();

and go to.

dataStream.Close();
response.Close();

not read my info error for status non-OK.

i will try use System.Net.WebException.

Thanks.

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Martin Dráb 237,795 Most Valuable Professional on at

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What you're saying doesn't make sense to me. It starts making sense if I imagine that you still have try/catch statement as in the code snippet that you showed at the beginning. Then it's a prove that GetResponse() throws an exception and your code where you're trying to get the message won't ever be called. Here you see the importance of debugging - you thought that your code does one thing but the debugger showed you that it does something else.

Catching the exception (as I suggested) will give you an opportunity to extra error details.

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Kreatif 10 on at

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Hi martin,

Please suggest me, whats wrong. i try to use exception System.Net.WebException.

try { System.Net.WebHeaderCollection headers = new System.Net.WebHeaderCollection(); object = new Newtonsoft.Json.Linq.JObject(); object.Add("PortId", _port); object.Add("PortName", _portName); json = Newtonsoft.Json.JsonConvert::SerializeObject(object); url = strFmt("%1", #longURL); clrObj = System.Net.WebRequest::Create(url); request = clrObj; request.Headers = headers; utf8 = System.Text.Encoding::get_UTF8(); byteArray = utf8.GetBytes(json); request.set_Method("POST"); request.set_KeepAlive(true); request.ContentType = "application/json"; request.set_ContentLength(byteArray.Length); dataStream = request.GetRequestStream(); dataStream.Write(byteArray, 0, byteArray.get_Length()); response = request.GetResponse(); dataStream = response.GetResponseStream(); dataStream.Close(); response.Close(); } catch(webException) { info(strFmt("Data not valid")); }

if i debug this code use wrong data, code stop in : catch(webException) with message "The remote server returned an error: (400) Bad Request." and not get my info.

Why my info can't show if data not valid?

Because, actually i have another action if data not valid. So, i wanna get this condition.

Thanks.

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Martin Dráb 237,795 Most Valuable Professional on at

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Try running your code without the debugger attached.

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Martin Dráb 237,795 Most Valuable Professional on at

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By the way, there is another problem with your code. You keep streams open if an exception is thrown. You should close them in both cases - if the try block completes without any error and if it fails. You can either utilize finally (try can be used with catch, with finally or with both catch and finally), or make it even simpler with using.

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