Ruby post a file stream via HTTP as multipart/form-data?

Question

Now,I have a need that post a file stream,not a local file.the process is:

client(file) ---> my server ----> third party Cloud Storage,the transfer is file stream. I have found this article: Ruby: How to post a file via HTTP as multipart/form-data?

require 'rest_client'
RestClient.post('http://localhost:3000/foo', 
:name_of_file_param => File.new('/path/to/file'))

you can see that the name_of_file_param is a local file,not stream.

so I want to know ,if this is file stream form the client ,what should I do

Patrick Oscity · Accepted Answer · 2014-08-16 08:46:07Z

1

You should be able to use any IO object, including a stream, as the parameter:

RestClient.post('http://localhost:3000/foo', :name_of_file_param => my_stream)

answered Aug 16, 2014 at 8:46

Patrick Oscity

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5 Comments

HXH Over a year ago

Thanks,this works.now I can use this upload the local file and a file stream.But now I need to upload a remote file to the Cloud Storage server,so I must read the remote file to a file stream,I use open-uri but this still not work,It seems that the stream format is not right.so what should I do? thanks!

Patrick Oscity Over a year ago

You should be able to write the result from open-uri to a Tempfile or a StringIO, then this should again behave like any other IO object.

HXH Over a year ago

yes,you are right,I want to write the result from open-uri to a StringIO. but when I use the open-uri to transfer the remote file to file stream,the Cloud Storage return a error that the format is no t right,I think the reason is that the encoding is not ASCII-8BIT

HXH Over a year ago

If the file is from user client upload then render text: params[:file] will raise an error "\xFF" from ASCII-8BIT to UTF-8 this shows that the file encoding is ASCII-8BIT.But the remote file render text: web_contents will return messy code like ��JFIF``��C so this encoding is not ASCII-8BIT not the same as custom uoload file.Can you tell me why? thanks!

Patrick Oscity Over a year ago

No idea. Please add a separate question for that and try to explain your problem in more detail. It is a completely different topic.

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