在Nodejs中处理多部分post方法请求抛出意外的字段错误(Handling multipart post method request in Nodejs throwing Unexpected

在Nodejs中处理多部分post方法请求抛出意外的字段错误(Handling multipart post method request in Nodejs throwing Unexpected Field Error)

我正在尝试使用Loopj Async Http Client从Android App请求一个post方法，并使用使用Multer Node Server处理请求使用下面的代码

步骤1

public static void post(String url, File entity, AsyncHttpResponseHandler responseHandler) { RequestParams params = new RequestParams(); try { params.put("image",entity); } catch (FileNotFoundException e) { e.printStackTrace(); } client.post(getAbsoluteUrl(url), params, responseHandler); }

getAbsoluteUrl返回实际的Url以发布请求

第2步（节点服务器）

router.post('/upload_image', function(req, res) { console.log(req.files); });

但是，在收到请求后，我的节点js服务器抛出了一些我无法理解的错误，经过几个小时的谷歌搜索和搜索其他选项后，我仍然无能为力解决问题。

这是问题：

POST /upload_image 500 1537.367 ms - 2057 Error: Unexpected field at makeError (/home/jkrishna/Documents/ProjectX/node_modules/multer/lib/make-error.js:12:13) at wrappedFileFilter (/home/jkrishna/Documents/ProjectX/node_modules/multer/index.js:39:19) at Busboy.<anonymous> (/home/jkrishna/Documents/ProjectX/node_modules/multer/lib/make-middleware.js:112:7) at Busboy.EventEmitter.emit (events.js:106:17) at Busboy.emit (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/lib/main.js:31:35) at PartStream.<anonymous> (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/lib/types/multipart.js:213:13) at PartStream.EventEmitter.emit (events.js:95:17) at HeaderParser.<anonymous> (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/lib/Dicer.js:51:16) at HeaderParser.EventEmitter.emit (events.js:95:17) at HeaderParser._finish (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/lib/HeaderParser.js:68:8) at SBMH.<anonymous> (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/lib/HeaderParser.js:40:12) at SBMH.EventEmitter.emit (events.js:95:17) at SBMH._sbmh_feed (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/node_modules/streamsearch/lib/sbmh.js:95:16) at SBMH.push (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/node_modules/streamsearch/lib/sbmh.js:56:14) at HeaderParser.push (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/lib/HeaderParser.js:46:19) at Dicer._oninfo (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/lib/Dicer.js:197:25)

I am trying a request a post method from Android App using Loopj Async Http Client, and handling the request using Node Server which uses Multer By using the code Below

Step-1

public static void post(String url, File entity, AsyncHttpResponseHandler responseHandler) { RequestParams params = new RequestParams(); try { params.put("image",entity); } catch (FileNotFoundException e) { e.printStackTrace(); } client.post(getAbsoluteUrl(url), params, responseHandler); }

The getAbsoluteUrl return the actual Url to post the request

Step-2 (Node Server)

router.post('/upload_image', function(req, res) { console.log(req.files); });

But, after receiving the request my node js server is throwing some error like this which i cannot Understand, After few hours of googling and searching for other option i am still clueless to solve the issue.

Here is the issue:

POST /upload_image 500 1537.367 ms - 2057 Error: Unexpected field at makeError (/home/jkrishna/Documents/ProjectX/node_modules/multer/lib/make-error.js:12:13) at wrappedFileFilter (/home/jkrishna/Documents/ProjectX/node_modules/multer/index.js:39:19) at Busboy.<anonymous> (/home/jkrishna/Documents/ProjectX/node_modules/multer/lib/make-middleware.js:112:7) at Busboy.EventEmitter.emit (events.js:106:17) at Busboy.emit (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/lib/main.js:31:35) at PartStream.<anonymous> (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/lib/types/multipart.js:213:13) at PartStream.EventEmitter.emit (events.js:95:17) at HeaderParser.<anonymous> (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/lib/Dicer.js:51:16) at HeaderParser.EventEmitter.emit (events.js:95:17) at HeaderParser._finish (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/lib/HeaderParser.js:68:8) at SBMH.<anonymous> (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/lib/HeaderParser.js:40:12) at SBMH.EventEmitter.emit (events.js:95:17) at SBMH._sbmh_feed (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/node_modules/streamsearch/lib/sbmh.js:95:16) at SBMH.push (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/node_modules/streamsearch/lib/sbmh.js:56:14) at HeaderParser.push (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/lib/HeaderParser.js:46:19) at Dicer._oninfo (/home/jkrishna/Documents/ProjectX/node_modules/multer/node_modules/busboy/node_modules/dicer/lib/Dicer.js:197:25)

最满意答案

问题是你已经配置了multer来查找字段名称为'file' ，但是在你的Android代码中你发送了一个名为'image'的字段。 改变其中一个，它应该工作。

The problem is that you've configured multer to look for a file whose field name is 'file', but in your Android code you're sending a field named 'image'. Change one or the other and it should work.