Multipart/form - HttpClient 4

[MaGGE]

Hello,

I want to upload a file, or more specific a file and some parameters, in a multipart/form.
I've not been able to find anything in the API docs or examples that show me how (for HTTPClient-4).
I've read many places about MultipartRequestEntity - but thats not part of HTTPCore/Client-4 as far as I can tell.

Is it possible to post multipart data using HTTPClient-4 ?

Thanks in advance!
Magnus

[Roland Weber]

Hello Magnus,

> I've not been able to find anything in the API docs or examples that show me
> how (for HTTPClient-4).
> I've read many places about MultipartRequestEntity - but thats not part of
> HTTPCore/Client-4 as far as I can tell.

That is correct. Multipart support is something we didn't port
to the 4.0 API:
http://hc.apache.org/status.html

> Is it possible to post multipart data using HTTPClient-4 ?

Yes, but you'll have to do some coding. There is no
MultipartRequestEntity that you can use out of the box.
One possibility is to re-use the multipart support of HttpClient 3.1:
http://marc.info/?l=httpclient-commons-dev&m=119708907028914&w=2
http://www.nabble.com/multipart-form-data-in-4.0-td14224819.html

If you don't want to depend on HttpClient 3, you can copy the
source and move it into a package of your own application.

hope this helps,
  Roland

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[MaGGE]

Ok, thanks for your advice.

If I make something half-decent - I'll post back here. :)

Regards,
Magnus

[MaGGE]

A very simple wrapper is attached here. This one offcourse requires the httpclient-3.1.jar in addition to httpclient-4 and httpcore.

There's an issue passing parameters from httpclient-4 HttpMethod.getProperties() (HttpParams from 4) to httpclient-3.1 and MultipartRequestEntity's constructor which takes HttpMethodParams (from 3.1). I was thinking about doing an iteration of the parameters, but as far as I could understand HttpMethodParams (from 3.1) is a static configuration, thus it's alot of typing work and research to map httpclient-4s dynamic properties to httpclient-3.1 configuration class. Furthermore I didn't find any way of iterating the the parameters (at a glance). So, I gave that one up. :)

In conclusion, MultipartRequestEntity is stuck with the default parameters.

MultipartEntityWrapper.java

It did it's job for me. That was pretty basic stuff, though. :)

Regards,
Magnus

[Roland Weber]

Hi Magnus,

thanks a lot for the feedback. Could you please
open an issue in JIRA and attach the code there?
If you check the "grant license for inclusion
in Apache" box, we can eventually put your code
somewhere into our contrib section.

https://issues.apache.org/jira/browse/HTTPCLIENT

thanks and cheers,
  Roland


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[MaGGE]

Hello,

I've opened JIRA issue https://issues.apache.org/jira/browse/HTTPCLIENT-728

...first time I've used JIRA so feel free to tell me if I did something wrong. :)

Regards,
Magnus

[Roland Weber]

MaGGE wrote:
> Hello,
>
> I've opened JIRA issue https://issues.apache.org/jira/browse/HTTPCLIENT-728

Great, thanks!

> ...first time I've used JIRA so feel free to tell me if I did something
> wrong. :)

perfect job :-)

cheers,
  Roland


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