blocks|key|2180849|text|由于似乎没有人知道答案，所以我深入研究了贝宝的REST的.NET+SDK的源代码。从本文中可以看出，在当前版本中，服务器返回任何4xx或5xx+HTTP状态代码时都没有返回错误消息的规定。我引用了this+question的答案，并修改了SDK以允许在适用时返回错误响应。以下是HttpConnection.cs的相关部分。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2180850|catch+(WebException+ex)
{
++++if+(ex.Response+is+HttpWebResponse)
++++{
++++++++HttpStatusCode+statusCode+=+((HttpWebResponse)ex.Response).StatusCode;
++++++++logger.Info("Got+"+%2B+statusCode.ToString()+%2B+"+response+from+server");
++++++++using+(WebResponse+wResponse+=+(HttpWebResponse)ex.Response)
++++++++{
++++++++++++using+(Stream+data+=+wResponse.GetResponseStream+())
++++++++++++{
++++++++++++++++string+text+=+new+StreamReader+(data).ReadToEnd+();
++++++++++++++++return+text;
++++++++++++}
++++++++}+++++++++++++++++++++++++++
++++}
++++if+(!RequiresRetry(ex))
++++{
++++++++//+Server+responses+in+the+range+of+4xx+and+5xx+throw+a+WebException
++++++++throw+new+ConnectionException("Invalid+HTTP+response+"+%2B+ex.Message);
++++}+++++++++++++++++++++++
}|code-block|syntax|javascript|2180851|当然，这需要更改调用函数才能正确解释错误响应。因为我只使用支付创建API，所以我选择了一些不适用于一般用途的快捷方式。但是，基本思想是，我创建了PaymentError和Detail类，然后修改了Payment.Create和PayPalResource.ConfigureAndExecute方法，以填充和传回PaymentError对象。|2180852|2180853|三年后，PayPal的API错误响应处理有了一些改进。由于其他一些问题，我不得不重新处理我的应用程序，并删除之前的代码。我发现您现在可以捕获一个PayPal.Exception.PaymentsException，然后将JSON响应字符串反序列化为一个PayPal.Exception.PaymentsError对象。|2180854|Catch+ex+As+PayPal.Exception.PaymentsException
++++Dim+tmpPmtErr+As+PayPal.Exception.PaymentsError+=+_
++++++++JsonConvert.DeserializeObject(Of+PayPal.Exception.PaymentsError)(ex.Response)|2180855|多亏了“兰斯在另一个答案”中的提醒，大家才能更仔细地检查例外情况。我试图使用该解决方案，但无法使其工作。|2180856|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/692342/net-httpwebrequest-getresponse-raises-exception-when-http-status-code-400-ba^0|2Q|D|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|D|3|E|5|F|7|13|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|14|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|15|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|16|8|@]|9|@]|C|$]]|$1|N|3|O|5|F|7|17|8|@]|9|@]|C|$G|H]]|$1|P|3|Q|5|6|7|18|8|@]|9|@]|C|$]]|$1|R|3|-4|5|6|7|19|8|@]|9|@]|C|$]]]|S|$T|$5|U|V|W|C|$X|Y]]]]

Since no one seems to know the answer to this, I dug into the source code of PayPal's .NET SDK for REST API. From this review, it appears that as of the current version, there is no provision for returning the error messages when any 4xx or 5xx HTTP status code is returned by the server. I referenced the answers to <a href="https://stackoverflow.com/questions/692342/net-httpwebrequest-getresponse-raises-exception-when-http-status-code-400-ba">this question</a> and have altered the SDK to allow for returning the error response when applicable. Here's the relevant portion of HttpConnection.cs. 

<pre><code>catch (WebException ex)
{
 if (ex.Response is HttpWebResponse)
 {
 HttpStatusCode statusCode = ((HttpWebResponse)ex.Response).StatusCode;
 logger.Info("Got " + statusCode.ToString() + " response from server");
 using (WebResponse wResponse = (HttpWebResponse)ex.Response)
 {
 using (Stream data = wResponse.GetResponseStream ())
 {
 string text = new StreamReader (data).ReadToEnd ();
 return text;
 }
 } 
 }
 if (!RequiresRetry(ex))
 {
 // Server responses in the range of 4xx and 5xx throw a WebException
 throw new ConnectionException("Invalid HTTP response " + ex.Message);
 } 
}
</code></pre>

Of course, this requires changes to the calling function to properly interpret the error response. Since I'm only using the Payment Create API, I took some shortcuts that wouldn't work for general use. However, the basic idea is that I created PaymentError and Detail classes, then altered the Payment.Create and PayPalResource.ConfigureAndExecute methods to populate and pass back a PaymentError object.

<hr>

Three years later and there is some improvement in PayPal's API error response handling. Because of some other issues I had to re-work my application, and rip out the prior code. I've found that you can now trap for a PayPal.Exception.PaymentsException, then deserialize the JSON Response string into a PayPal.Exception.PaymentsError object.

<pre><code>Catch ex As PayPal.Exception.PaymentsException
 Dim tmpPmtErr As PayPal.Exception.PaymentsError = _
 JsonConvert.DeserializeObject(Of PayPal.Exception.PaymentsError)(ex.Response)
</code></pre>

Thanks to @lance in the other answer for the heads-up to examine the exceptions more closely. I attempted to use that solution, but could not make it work.

blocks|key|2180903|text|@Jonathan，REST集成了log4net，如果您设置日志文件，它将输出完整的错误响应。必须将此配置部分添加到web.config中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2180904|<section+name="log4net"+type="log4net.Config.Log4NetConfigurationSectionHandler,+log4net"/>|code-block|syntax|javascript|2180905|并设置以下选项：|2180906|<log4net>
<appender+name="FileAppender"+type="log4net.Appender.FileAppender">
++<file+value="rest-api.log"/>
++<appendToFile+value="true"/>
++<layout+type="log4net.Layout.PatternLayout">
++++<conversionPattern+value="%25date+[%25thread]+%25-5level+%25logger+[%25property{NDC}]+%25message%25newline"/>
++</layout>
</appender>
<root>
++<level+value="DEBUG"/>
++<appender-ref+ref="FileAppender"/>
</root>|2180907|​|2180908|打开global.asax并将其添加到Application_Start中：|2180909|log4net.Config.XmlConfigurator.Configure();|2180910|现在，只要在日志文件夹上设置了写权限，那么PayPal+REST就会向日志文件发出错误消息。|2180911|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

@Jonathan, The REST API has log4net integrated and will output the full error response to a log file if you set it up. You must add this config section to your web.config:

<pre><code>&lt;section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/&gt;
</code></pre>

and also set the options:

<pre><code>&lt;log4net&gt;
&lt;appender name="FileAppender" type="log4net.Appender.FileAppender"&gt;
 &lt;file value="rest-api.log"/&gt;
 &lt;appendToFile value="true"/&gt;
 &lt;layout type="log4net.Layout.PatternLayout"&gt;
 &lt;conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] %message%newline"/&gt;
 &lt;/layout&gt;
&lt;/appender&gt;
&lt;root&gt;
 &lt;level value="DEBUG"/&gt;
 &lt;appender-ref ref="FileAppender"/&gt;
&lt;/root&gt;
</code></pre>



Open your global.asax and add this into the Application_Start:

<pre><code>log4net.Config.XmlConfigurator.Configure();
</code></pre>

Now, as long as there are write permissions set on your log folder, then the PayPal REST SDK will spit out error messages to the log file.

blocks|key|1449219|text|我今天才开始处理SDK和API，然后马上就遇到了这个问题。我的意思是，如果我要创建自己的表单来处理付款，我想给我的用户的反馈，如果有任何问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1449220|无论如何，我确实在内部异常中找到了一些隐藏的信息。也许这个能帮上忙。|1449221|catch+(PayPal.Exception.PayPalException+ex)
{
++++if+(ex.InnerException+is+PayPal.Exception.ConnectionException)
++++{
++++++++context.Response.Write(((PayPal.Exception.ConnectionException)ex.InnerException).Response);
++++}
++++else
++++{
++++++++context.Response.Write(ex.Message);
++++}
}|code-block|syntax|javascript|1449222|由此产生的答复：|1449223|{"name":"VALIDATION_ERROR","details":[{"field":"payer.funding_instruments[0].credit_card.number","issue":"Must+be+numeric"}],"message":"Invalid+request+-+see+details","information_link":"https://developer.paypal.com/webapps/developer/docs/api/#VALIDATION_ERROR","debug_id":"0548e52ef9d95"}+|1449224|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I only started messing with the SDK and API today and ran into this issue right away. I mean, if I'm going to create my own form to handle payments, I'd like to give my user's feedback if anything went wrong. 

In any case, I did find some hidden info in the inner exception. Maybe this will help.

<pre><code>catch (PayPal.Exception.PayPalException ex)
{
 if (ex.InnerException is PayPal.Exception.ConnectionException)
 {
 context.Response.Write(((PayPal.Exception.ConnectionException)ex.InnerException).Response);
 }
 else
 {
 context.Response.Write(ex.Message);
 }
}
</code></pre>

The resulting response: 

<pre><code>{"name":"VALIDATION_ERROR","details":[{"field":"payer.funding_instruments[0].credit_card.number","issue":"Must be numeric"}],"message":"Invalid request - see details","information_link":"https://developer.paypal.com/webapps/developer/docs/api/#VALIDATION_ERROR","debug_id":"0548e52ef9d95"} 
</code></pre>

blocks|key|2180935|text|我的问题是，我的total、detail.subtotal和items.price传递的值为$1,000.00，它需要十进制，所以请使用以下内容：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2180936|total+=+Regex.Replace(model.OrderTotal,+"[%5E0-9.]",+"")|code-block|syntax|javascript|2180937|entityMap^0|8|5|E|F|U|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

My problem was that my <code>total</code>, <code>detail.subtotal</code>, and <code>items.price</code> were passing in values like $1,000.00 and it needs decimal so use something like:

<pre><code>total = Regex.Replace(model.OrderTotal, "[^0-9.]", "")
</code></pre>

blocks|key|1449236|text|如果在美国以外使用全球化，则需要将小数转换为InvariantCulture：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1449237|order.GetTotal().ToString("N2",+CultureInfo.InvariantCulture)|code-block|syntax|javascript|1449238|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you are using a globalization outside the US you need to convert your decimals to a InvariantCulture: 

<pre><code>order.GetTotal().ToString("N2", CultureInfo.InvariantCulture)
</code></pre>

blocks|key|1977444|text|改进这里的解决方案是..。简单(导入PayPal)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1977445|++++Try
++++Catch+ex+As+PaymentsException
++++++++For+Each+i+In+ex.Details.details
++++++++++++Response.Write(i.field)+'Name+of+Field
++++++++++++Response.Write(i.code)+'Code+If+Any
++++++++++++Response.Write(i.issue)+'Validation+Issue
++++++++Next
++++End+Try|code-block|syntax|javascript|1977446|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Improving the solution here is... Simply
(Imports PayPal)

<pre><code> Try
 Catch ex As PaymentsException
 For Each i In ex.Details.details
 Response.Write(i.field) 'Name of Field
 Response.Write(i.code) 'Code If Any
 Response.Write(i.issue) 'Validation Issue
 Next
 End Try
</code></pre>

blocks|key|1977451|text|以上所有的解决方案都没有真正抓住问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1977452|不久前，我遇到了一个类似的问题。在调试我的代码之后，我发现我正在做的事务逻辑上是错误的。小计是0.25美元，paypal服务器看到了，拒绝处理，并给了我400个坏请求。|1977453|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

All of the above solution of dont really grasp the problem .. 

I ran in to a similar problem a while back .. after debugging my code i found out that the transaction that i was making was logically wrong.. the subtotal was off be $0.25 and paypal server saw it and refused to process it, and gave me 400 bad request

blocks|key|1449286|text|这似乎已经改变了，虽然其中许多答案指向了正确的方向，但没有一个对我有效。这相当于我目前最不满意的答案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1449287|catch+(PayPal.PaymentsException+ex)
{
++++context.Response.Write(ex.Response);
}|code-block|syntax|javascript|1449288|答复如下：|1449289|{"name":"VALIDATION_ERROR","details":[{"field":"start_date","issue":"Agreement+start+date+is+required,+should+be+valid+and+greater+than+the+current+date.+Should+be+consistent+with+ISO+8601+Format"}],"message":"Invalid+request.+See+details.","information_link":"https://developer.paypal.com/docs/api/payments.billing-agreements#errors","debug_id":"8c56c13fccd49"}|1449290|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This seems to have changed, and while many of these answers point in the right direction, none of them worked exactly for me. This is my equivalent of the currently most upvoted answer:

<pre><code>catch (PayPal.PaymentsException ex)
{
 context.Response.Write(ex.Response);
}
</code></pre>

with the response:

<pre><code>{"name":"VALIDATION_ERROR","details":[{"field":"start_date","issue":"Agreement start date is required, should be valid and greater than the current date. Should be consistent with ISO 8601 Format"}],"message":"Invalid request. See details.","information_link":"https://developer.paypal.com/docs/api/payments.billing-agreements#errors","debug_id":"8c56c13fccd49"}
</code></pre>

I'm working in the sandbox and using the PayPal REST .net SDK method Payment.Create with a CreditCard object. When all parameters are valid and using the test CC number from <a href="https://developer.paypal.com/webapps/developer/docs/integration/direct/accept-credit-cards/">https://developer.paypal.com/webapps/developer/docs/integration/direct/accept-credit-cards/</a>, the Payment object is returned from that method and all is well.

However, when a parameter is not valid, such as a past expiration date or a CC number not recognized by the sandbox, the Payment object is not returned. Instead the method throws an exception: "Exception in HttpConnection Execute: Invalid HTTP response The remote server returned an error: (400) Bad Request", but with no further explanation.

When I execute the same request in cURL, in addition to the "400 Bad Request", I get a JSON response. This includes more helpful messages such as "VALIDATION_ERROR" and "Invalid expiration (cannot be in the past)".

My question: Is there a way to get these messages back from the SDK? 

What I've tried:

<ul>
<li>PayPal docs: <a href="https://developer.paypal.com/webapps/developer/docs/api/#errors">https://developer.paypal.com/webapps/developer/docs/api/#errors</a> 
This document mentions that in the case of an error, they return the details in the body of the response. Unfortunately, it doesn't give a clue about whether these are accessible by the SDK.</li>
<li>Various Google and SO searches.</li>
<li>The PizzaApp sample code provided with the SDK has nothing in the way of exception handling or further insight into this problem. </li>
<li>I see a PayPalException object in the SDK, but have not found anything that indicates how it should be used or if it's even relevant to this problem.</li>
</ul>

All help is much appreciated.

PayPal REST API .net SDK - 400 Bad Requests

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在沙箱中工作，并使用PayPal REST .net SDK方法Payment.Create和CreditCard对象。当所有参数都是有效的，并且使用来自的测试CC号时，该方法将返回支付对象，并且all是好的。但是，如果参数无效，例如过去的过期日期或沙箱无法识别的CC号，则不会返回支付对象。相反，该方法抛出一个异常...

问PayPal REST .net SDK - 400坏请求
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问PayPal REST .net SDK - 400坏请求EN