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Posted to httpclient-users@hc.apache.org by Karthik R <ra...@zoho.com> on 2016/01/12 13:49:28 UTC

Upgrade from 3.1 to 4.5 - Multipart form entity related exception

Hi,




We want to use the HttpAsyncClient and NIO so that we can handle more requests with fewer threads. 

I am tasked with migrating from HttpComponents 3.1 to 4.5. The new API is very different from the earlier one and I need some help with the same.



ByteArrayPartSource horA = new ByteArrayPartSource("data", data.toString().getBytes("UTF-8")); 




FilePart p1 = new FilePart("data", horA); 

StringPart encodingPart = new StringPart("encoded", "" + _encode); 



StringPart contentPart = new StringPart("content-type", "text/xml"); 



Part[] partes = { p1, encodingPart, contentPart }; 

post.setRequestEntity(new MultipartRequestEntity(partes, post.getParams()));



I rewrote the whole thing above as:



HttpEntity postEntity = MultipartEntityBuilder.create() 


      .addTextBody("content-type", contentType) 

      .addTextBody("encoded", ""+true) 

      .addBinaryBody("data", data.toString().getBytes("UTF-8")) 

      .build(); 



post.setEntity(postEntity);



This results in UnsupportedOperationException:Multipart form entity does not implement #getContent() 




I read similar posts on this list but didn't understand what I should do. I don't want to write copy content into memory/buffer. What is the right way to write this using 4.5 and HttpAsyncClient? Any pointers will be really appreciated. 



Thanks!

Re: Upgrade from 3.1 to 4.5 - Multipart form entity related exception

Posted by Oleg Kalnichevski <ol...@apache.org>.
On Wed, 2016-01-13 at 00:33 -0800, Karthik R wrote:
> 
> Hi all,
> 
> 
> 
> Just wanted to post a quick update. I have changed it as below and it works:
> 
> 
> 
> NByteArrayEntity nbe = new NByteArrayEntity(data.toString().getBytes("UTF-8")); 
> 
> post.setEntity(nbe); 
> 
> post.addHeader(HttpHeaders.AUTHORIZATION,"Basic "+authStr); 
> 
> post.addHeader(HttpHeaders.CONTENT_TYPE,contentType);
> 
> I stopped using MultipartEntityBuilder. It doesn't really give NIO support I think because it needs to be wrapped in a BufferedHttpEntity (this makes a copy of the content in memory). I am not sure if the above reasoning is correct or complete. Perhaps some one can clarify.
> 
> 

The multipart entity implementation in HttpClient is inherently
synchronous (blocking). It cannot be used with the async version of HC
without buffering. However, one can develop a custom
HttpAsyncContentProducer that streams out parts of multipart entity
without blocking.

Oleg


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Re: Upgrade from 3.1 to 4.5 - Multipart form entity related exception

Posted by Karthik R <ra...@zoho.com>.

Hi all,



Just wanted to post a quick update. I have changed it as below and it works:



NByteArrayEntity nbe = new NByteArrayEntity(data.toString().getBytes("UTF-8")); 

post.setEntity(nbe); 

post.addHeader(HttpHeaders.AUTHORIZATION,"Basic "+authStr); 

post.addHeader(HttpHeaders.CONTENT_TYPE,contentType);

I stopped using MultipartEntityBuilder. It doesn't really give NIO support I think because it needs to be wrapped in a BufferedHttpEntity (this makes a copy of the content in memory). I am not sure if the above reasoning is correct or complete. Perhaps some one can clarify.



Thanks again!




---- On Tue, 12 Jan 2016 04:49:28 -0800 Karthik R &lt;rabbitcodes@zoho.com&gt;wrote ---- 




Hi, 









We want to use the HttpAsyncClient and NIO so that we can handle more requests with fewer threads. 



I am tasked with migrating from HttpComponents 3.1 to 4.5. The new API is very different from the earlier one and I need some help with the same. 







ByteArrayPartSource horA = new ByteArrayPartSource("data", data.toString().getBytes("UTF-8")); 









FilePart p1 = new FilePart("data", horA); 



StringPart encodingPart = new StringPart("encoded", "" + _encode); 







StringPart contentPart = new StringPart("content-type", "text/xml"); 







Part[] partes = { p1, encodingPart, contentPart }; 



post.setRequestEntity(new MultipartRequestEntity(partes, post.getParams())); 







I rewrote the whole thing above as: 







HttpEntity postEntity = MultipartEntityBuilder.create() 





.addTextBody("content-type", contentType) 



.addTextBody("encoded", ""+true) 



.addBinaryBody("data", data.toString().getBytes("UTF-8")) 



.build(); 







post.setEntity(postEntity); 







This results in UnsupportedOperationException:Multipart form entity does not implement #getContent() 









I read similar posts on this list but didn't understand what I should do. I don't want to write copy content into memory/buffer. What is the right way to write this using 4.5 and HttpAsyncClient? Any pointers will be really appreciated. 







Thanks!