Upload files with Faraday

Question

I am having problems uploading a file to a web service using Faraday.

My code is:

conn = Faraday.new('http://myapi') do |f| f.request :multipart end payload = { :file => Faraday::UploadIO.new('...', 'image/jpeg') } conn.post('/', payload) 

Nothing of the kind happens after trying to publish. When I check the answer to this , I see:

 #<Faraday::Response:0x007fd9e5903870 @env={:method=>:post, :body=>#<Faraday::CompositeReadIO:0x007fd9e5903a50 @parts=[#<Parts::FilePart:0x007fd9e5903e38 @head="-------------RubyMultipartPost\r\nContent-Disposition: form-data; name=\"file\"; filename=\"indymade-badge-horizontal.png\"\r\nContent-Length: 7821\r\nContent-Type: image/png\r\nContent-Transfer-Encoding: binary\r\n\r\n", @foot="\r\n", @length=8026, @io=#<CompositeReadIO:0x007fd9e5903b68 @ios=[#<StringIO:0x007fd9e5903bb8>, #<UploadIO:0x007fd9e514a3b8 @content_type="image/png", @original_filename="indymade-badge-horizontal.png", @local_path="/Users/anthonator/Downloads/indymade-badge-horizontal.png", @io=#<File:/Users/anthonator/Downloads/indymade-badge-horizontal.png>, @opts={}>, #<StringIO:0x007fd9e5903b90>], @index=0>>, #<Parts::EpiloguePart:0x007fd9e5903ac8 @part="-------------RubyMultipartPost--\r\n\r\n", @io=#<StringIO:0x007fd9e5903a78>>], @ios=[#<CompositeReadIO:0x007fd9e5903b68 @ios=[#<StringIO:0x007fd9e5903bb8>, #<UploadIO:0x007fd9e514a3b8 @content_type="image/png", @original_filename="indymade-badge-horizontal.png", @local_path="/Users/anthonator/Downloads/indymade-badge-horizontal.png", @io=#<File:/Users/anthonator/Downloads/indymade-badge-horizontal.png>, @opts={}>, #<StringIO:0x007fd9e5903b90>], @index=0>, #<StringIO:0x007fd9e5903a78>], @index=0>, :url=>#<URI::HTTPS:0x007fd9e5909d60 URL:https://myapi>, :request_headers=>{"User-Agent"=>"Faraday v0.8.7", "Content-Type"=>"multipart/form-data;boundary=-----------RubyMultipartPost", "Content-Length"=>"8062"}, :parallel_manager=>nil, :request=>{:proxy=>nil, :boundary=>"-----------RubyMultipartPost"}, :ssl=>{}, :response=>#<Faraday::Response:0x007fd9e5903870 ...>}, @on_complete_callbacks=[]> irb(main):065:0> response.inspect => "#<Faraday::Response:0x007fd9e5903870 @env={:method=>:post, :body=>#<Faraday::CompositeReadIO:0x007fd9e5903a50 @parts=[#<Parts::FilePart:0x007fd9e5903e38 @head=\"-------------RubyMultipartPost\\r\\nContent-Disposition: form-data; name=\\\"file\\\"; filename=\\\"indymade-badge-horizontal.png\\\"\\r\\nContent-Length: 7821\\r\\nContent-Type: image/png\\r\\nContent-Transfer-Encoding: binary\\r\\n\\r\\n\", @foot=\"\\r\\n\", @length=8026, @io=#<CompositeReadIO:0x007fd9e5903b68 @ios=[#<StringIO:0x007fd9e5903bb8>, #<UploadIO:0x007fd9e514a3b8 @content_type=\"image/png\", @original_filename=\"indymade-badge-horizontal.png\", @local_path=\"/Users/anthonator/Downloads/indymade-badge-horizontal.png\", @io=#<File:/Users/anthonator/Downloads/indymade-badge-horizontal.png>, @opts={}>, #<StringIO:0x007fd9e5903b90>], @index=0>>, #<Parts::EpiloguePart:0x007fd9e5903ac8 @part=\"-------------RubyMultipartPost--\\r\\n\\r\\n\", @io=#<StringIO:0x007fd9e5903a78>>], @ios=[#<CompositeReadIO:0x007fd9e5903b68 @ios=[#<StringIO:0x007fd9e5903bb8>, #<UploadIO:0x007fd9e514a3b8 @content_type=\"image/png\", @original_filename=\"indymade-badge-horizontal.png\", @local_path=\"/Users/anthonator/Downloads/indymade-badge-horizontal.png\", @io=#<File:/Users/anthonator/Downloads/indymade-badge-horizontal.png>, @opts={}>, #<StringIO:0x007fd9e5903b90>], @index=0>, #<StringIO:0x007fd9e5903a78>], @index=0>, :url=>#<URI::HTTPS:0x007fd9e5909d60 URL:https://myapi>, :request_headers=>{\"User-Agent\"=>\"Faraday v0.8.7\", \"Content-Type\"=>\"multipart/form-data;boundary=-----------RubyMultipartPost\", \"Content-Length\"=>\"8062\"}, :parallel_manager=>nil, :request=>{:proxy=>nil, :boundary=>\"-----------RubyMultipartPost\"}, :ssl=>{}, :response=>#<Faraday::Response:0x007fd9e5903870 ...>}, @on_complete_callbacks=[]>" 

The body is set to a CompositeReadIO object and seems to never send a request.

Answer 1

Turns out I needed to specify an adapter. Here is the code that ended up working.

 conn = Faraday.new('http://myapi') do |f| f.request :multipart f.request :url_encoded f.adapter :net_http # This is what ended up making it work end payload = { :file => Faraday::UploadIO.new('...', 'image/jpeg') } conn.post('/', payload) 

Answer 2

Something like this solved my problem:

 conn = Faraday.new(url: URL) do |faraday| faraday.request :multipart #make sure this is set before url_encoded faraday.request :url_encoded faraday.adapter Faraday.default_adapter end file = Faraday::UploadIO.new( params[:image].tempfile.path, params[:image].content_type, params[:image].original_filename ) payload = { :file => file } conn.post('/', payload)