Ruby How to post a file via HTTP as multipart form-data

Question

I want to do an HTTP POST that looks like an HMTL form posted from a browser  Specifically  post some text fields and a file field   Posting text fields is straightforward  there s an example right there in the net http rdocs  but I can t figure out how to post a file along with it   Net  HTTP doesn t look like the best idea  curb is looking good

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there s also nick sieger s multipart-post to add to the long list of possible solutions

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Here is my solution after trying other ones available on this post  I m using it to upload photo on TwitPic     def upload photo       curl -F media    photo path  -F username    username  -F password    password  -F message    photo title   http   twitpic com api uploadAndPost    end

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Well the solution with NetHttp has a drawback that is when posting big files it loads the whole file into memory first   After playing a bit with it I came up with the following solution   class Multipart    def initialize  file names        file names   file names   end    def post  to url       boundary    ----RubyMultipartClient    rand 1000000  to s    ZZZZZ       parts          streams           file names each do  param name  filepath        pos   filepath rindex            filename   filepath pos   1  filepath length - pos        parts  lt  lt  StringPart new    --    boundary     r n           Content-Disposition  form-data  name       param name to s        filename       filename       r n           Content-Type  video x-msvideo r n r n         stream   File open filepath   rb         streams  lt  lt  stream       parts  lt  lt  StreamPart new  stream  File size filepath       end     parts  lt  lt  StringPart new     r n--    boundary    -- r n         post stream   MultipartStream new  parts        url   URI parse  to url       req   Net  HTTP  Post new url path      req content length   post stream size     req content type    multipart form-data  boundary     boundary     req body stream   post stream     res   Net  HTTP new url host  url port  start   http  http request req         streams each do  stream        stream close        end      res   end  end  class StreamPart   def initialize  stream  size        stream   size   stream  size   end    def size      size   end    def read   offset  how much        stream read   how much     end end  class StringPart   def initialize   str        str   str   end    def size      str length   end    def read   offset  how much        str offset  how much    end end  class MultipartStream   def initialize  parts        parts   parts      part no   0       part offset   0    end    def size     total   0      parts each do  part        total    part size     end     total   end    def read   how much        if  part no  gt    parts size       return nil      end      how much current part    parts  part no  size -  part offset      how much current part   if how much current part  gt  how much       how much     else       how much current part     end      how much next part   how much - how much current part      current part    parts  part no  read  part offset  how much current part        if how much next part  gt  0        part no    1        part offset   0       next part   read   how much next part          current part   if next part         next part       else                  end     else        part offset    how much current part       current part     end   end end

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Ok  here s a simple example using curb   require  yaml  require  curb     prepare post data post data   fields hash map    k  v  Curl  PostField content k  v to s    post data  lt  lt  Curl  PostField file  file     path to file        post c   Curl  Easy new  http   localhost 3000 foo   c multipart form post   true c http post post data     print response y  c response code  c body str

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I like RestClient  It encapsulates net http with cool features like multipart form data   require  rest client  RestClient post  http   localhost 3000 foo       name of file param   gt  File new   path to file      It also supports streaming   gem install rest-client will get you started

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The multipart-post gem works pretty well with Rails 4 Net  HTTP  no other special gem  def model params   require params   params require  model  permit  param one   param two   param three   avatar    require params  avatar    model params  avatar  present    UploadIO new model params  avatar  tempfile  model params  avatar  content type  model params  avatar  original filename    nil   require params end  require  net http post multipart   url   URI parse  http   www example com upload   Net  HTTP start url host  url port  do  http    req   Net  HTTP  Post  Multipart new url  model params    key    authorization key    req add field  Authorization   key   add to Headers   http use ssl    url scheme     https     http request req  end   https   github com Feuda multipart-post tree patch-1

User · Answer

Ok  here s a simple example using curb   require  yaml  require  curb     prepare post data post data   fields hash map    k  v  Curl  PostField content k  v to s    post data  lt  lt  Curl  PostField file  file     path to file        post c   Curl  Easy new  http   localhost 3000 foo   c multipart form post   true c http post post data     print response y  c response code  c body str

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curb looks like a great solution  but in case it doesn t meet your needs  you can do it with Net  HTTP   A multipart form post is just a carefully-formatted string with some extra headers   It seems like every Ruby programmer who needs to do multipart posts ends up writing their own little library for it  which makes me wonder why this functionality isn t built-in   Maybe it is     Anyway  for your reading pleasure  I ll go ahead and give my solution here   This code is based off of examples I found on a couple of blogs  but I regret that I can t find the links anymore   So I guess I just have to take all the credit for myself     The module I wrote for this contains one public class  for generating the form data and headers out of a hash of String and File objects   So for example  if you wanted to post a form with a string parameter named  title  and a file parameter named  document   you would do the following    prepare the query data  headers   Multipart  Post prepare query  title    gt  my string   document    gt  my file    Then you just do a normal POST with Net  HTTP   http   Net  HTTP new upload uri host  upload uri port  res   http start   con  con post upload uri path  data  headers      Or however else you want to do the POST   The point is that Multipart returns the data and headers that you need to send   And that s it   Simple  right   Here s the code for the Multipart module  you need the mime-types gem      Takes a hash of string and file parameters and returns a string of text   formatted to be sent as a multipart form post      Author   Cody Brimhall  lt mailto brimhall somuchwit com gt    Created   22 Feb 2008   License   Distributed under the terms of the WTFPL  http   www wtfpl net txt copying    require  rubygems  require  mime types  require  cgi    module Multipart   VERSION    1 0 0       Formats a given hash as a multipart form post     If a hash value responds to  string or  read messages  then it is     interpreted as a file and processed accordingly  otherwise  it is assumed     to be a string   class Post       We have to pretend we re a web browser        USERAGENT    Mozilla 5 0  Macintosh  U  PPC Mac OS X  en-us  AppleWebKit 523 10 6  KHTML  like Gecko  Version 3 0 4 Safari 523 10 6      BOUNDARY    0123456789ABLEWASIEREISAWELBA9876543210      CONTENT TYPE    multipart form-data  boundary    BOUNDARY        HEADER      Content-Type    gt  CONTENT TYPE   User-Agent    gt  USERAGENT        def self prepare query params        fp             params each do  k  v            Are we trying to make a file parameter          if v respond to   path  and v respond to   read  then           fp push FileParam new k  v path  v read             We must be trying to make a regular parameter         else           fp push StringParam new k  v           end       end          Assemble the request body using the special multipart format       query   fp collect   p   --    BOUNDARY     r n    p to multipart   join        --    BOUNDARY    --        return query  HEADER     end   end    private      Formats a basic string key value pair for inclusion with a multipart post   class StringParam     attr accessor  k   v      def initialize k  v         k   k        v   v     end      def to multipart       return  Content-Disposition  form-data  name     CGI  escape k     r n r n  v  r n      end   end      Formats the contents of a file or string for inclusion with a multipart     form post   class FileParam     attr accessor  k   filename   content      def initialize k  filename  content         k   k        filename   filename        content   content     end      def to multipart         If we can tell the possible mime-type from the filename  use the         first in the list  otherwise  use  application octet-stream        mime type   MIME  Types type for filename  0     MIME  Types  application octet-stream   0        return  Content-Disposition  form-data  name     CGI  escape k      filename      filename     r n                  Content-Type     mime type simplified   r n r n   content   r n      end   end end

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curb looks like a great solution  but in case it doesn t meet your needs  you can do it with Net  HTTP   A multipart form post is just a carefully-formatted string with some extra headers   It seems like every Ruby programmer who needs to do multipart posts ends up writing their own little library for it  which makes me wonder why this functionality isn t built-in   Maybe it is     Anyway  for your reading pleasure  I ll go ahead and give my solution here   This code is based off of examples I found on a couple of blogs  but I regret that I can t find the links anymore   So I guess I just have to take all the credit for myself     The module I wrote for this contains one public class  for generating the form data and headers out of a hash of String and File objects   So for example  if you wanted to post a form with a string parameter named  title  and a file parameter named  document   you would do the following    prepare the query data  headers   Multipart  Post prepare query  title    gt  my string   document    gt  my file    Then you just do a normal POST with Net  HTTP   http   Net  HTTP new upload uri host  upload uri port  res   http start   con  con post upload uri path  data  headers      Or however else you want to do the POST   The point is that Multipart returns the data and headers that you need to send   And that s it   Simple  right   Here s the code for the Multipart module  you need the mime-types gem      Takes a hash of string and file parameters and returns a string of text   formatted to be sent as a multipart form post      Author   Cody Brimhall  lt mailto brimhall somuchwit com gt    Created   22 Feb 2008   License   Distributed under the terms of the WTFPL  http   www wtfpl net txt copying    require  rubygems  require  mime types  require  cgi    module Multipart   VERSION    1 0 0       Formats a given hash as a multipart form post     If a hash value responds to  string or  read messages  then it is     interpreted as a file and processed accordingly  otherwise  it is assumed     to be a string   class Post       We have to pretend we re a web browser        USERAGENT    Mozilla 5 0  Macintosh  U  PPC Mac OS X  en-us  AppleWebKit 523 10 6  KHTML  like Gecko  Version 3 0 4 Safari 523 10 6      BOUNDARY    0123456789ABLEWASIEREISAWELBA9876543210      CONTENT TYPE    multipart form-data  boundary    BOUNDARY        HEADER      Content-Type    gt  CONTENT TYPE   User-Agent    gt  USERAGENT        def self prepare query params        fp             params each do  k  v            Are we trying to make a file parameter          if v respond to   path  and v respond to   read  then           fp push FileParam new k  v path  v read             We must be trying to make a regular parameter         else           fp push StringParam new k  v           end       end          Assemble the request body using the special multipart format       query   fp collect   p   --    BOUNDARY     r n    p to multipart   join        --    BOUNDARY    --        return query  HEADER     end   end    private      Formats a basic string key value pair for inclusion with a multipart post   class StringParam     attr accessor  k   v      def initialize k  v         k   k        v   v     end      def to multipart       return  Content-Disposition  form-data  name     CGI  escape k     r n r n  v  r n      end   end      Formats the contents of a file or string for inclusion with a multipart     form post   class FileParam     attr accessor  k   filename   content      def initialize k  filename  content         k   k        filename   filename        content   content     end      def to multipart         If we can tell the possible mime-type from the filename  use the         first in the list  otherwise  use  application octet-stream        mime type   MIME  Types type for filename  0     MIME  Types  application octet-stream   0        return  Content-Disposition  form-data  name     CGI  escape k      filename      filename     r n                  Content-Type     mime type simplified   r n r n   content   r n      end   end end

User · Answer

I like RestClient  It encapsulates net http with cool features like multipart form data   require  rest client  RestClient post  http   localhost 3000 foo       name of file param   gt  File new   path to file      It also supports streaming   gem install rest-client will get you started

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there s also nick sieger s multipart-post to add to the long list of possible solutions

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Another one using only standard libraries   uri   URI  https   some end point some path   request   Net  HTTP  Post new uri  request  Authorization      If you need some headers  form data      photos   photo tempfile     or File open   in case of local file  request set form form data   multipart form-data  response   Net  HTTP start uri hostname  uri port  use ssl  true  do  http    pay attention to use ssl if you need it   http request request  end   Tried a lot of approaches but only this was worked for me

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restclient did not work for me until I overrode create file field in RestClient  Payload  Multipart   It was creating a  Content-Disposition  multipart form-data  in each part where it should be    Content-Disposition  form-data      http   www ietf org rfc rfc2388 txt  My fork is here if you need it  git github com kcrawford rest-client git

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I like RestClient  It encapsulates net http with cool features like multipart form data   require  rest client  RestClient post  http   localhost 3000 foo       name of file param   gt  File new   path to file      It also supports streaming   gem install rest-client will get you started

User · Answer

curb looks like a great solution  but in case it doesn t meet your needs  you can do it with Net  HTTP   A multipart form post is just a carefully-formatted string with some extra headers   It seems like every Ruby programmer who needs to do multipart posts ends up writing their own little library for it  which makes me wonder why this functionality isn t built-in   Maybe it is     Anyway  for your reading pleasure  I ll go ahead and give my solution here   This code is based off of examples I found on a couple of blogs  but I regret that I can t find the links anymore   So I guess I just have to take all the credit for myself     The module I wrote for this contains one public class  for generating the form data and headers out of a hash of String and File objects   So for example  if you wanted to post a form with a string parameter named  title  and a file parameter named  document   you would do the following    prepare the query data  headers   Multipart  Post prepare query  title    gt  my string   document    gt  my file    Then you just do a normal POST with Net  HTTP   http   Net  HTTP new upload uri host  upload uri port  res   http start   con  con post upload uri path  data  headers      Or however else you want to do the POST   The point is that Multipart returns the data and headers that you need to send   And that s it   Simple  right   Here s the code for the Multipart module  you need the mime-types gem      Takes a hash of string and file parameters and returns a string of text   formatted to be sent as a multipart form post      Author   Cody Brimhall  lt mailto brimhall somuchwit com gt    Created   22 Feb 2008   License   Distributed under the terms of the WTFPL  http   www wtfpl net txt copying    require  rubygems  require  mime types  require  cgi    module Multipart   VERSION    1 0 0       Formats a given hash as a multipart form post     If a hash value responds to  string or  read messages  then it is     interpreted as a file and processed accordingly  otherwise  it is assumed     to be a string   class Post       We have to pretend we re a web browser        USERAGENT    Mozilla 5 0  Macintosh  U  PPC Mac OS X  en-us  AppleWebKit 523 10 6  KHTML  like Gecko  Version 3 0 4 Safari 523 10 6      BOUNDARY    0123456789ABLEWASIEREISAWELBA9876543210      CONTENT TYPE    multipart form-data  boundary    BOUNDARY        HEADER      Content-Type    gt  CONTENT TYPE   User-Agent    gt  USERAGENT        def self prepare query params        fp             params each do  k  v            Are we trying to make a file parameter          if v respond to   path  and v respond to   read  then           fp push FileParam new k  v path  v read             We must be trying to make a regular parameter         else           fp push StringParam new k  v           end       end          Assemble the request body using the special multipart format       query   fp collect   p   --    BOUNDARY     r n    p to multipart   join        --    BOUNDARY    --        return query  HEADER     end   end    private      Formats a basic string key value pair for inclusion with a multipart post   class StringParam     attr accessor  k   v      def initialize k  v         k   k        v   v     end      def to multipart       return  Content-Disposition  form-data  name     CGI  escape k     r n r n  v  r n      end   end      Formats the contents of a file or string for inclusion with a multipart     form post   class FileParam     attr accessor  k   filename   content      def initialize k  filename  content         k   k        filename   filename        content   content     end      def to multipart         If we can tell the possible mime-type from the filename  use the         first in the list  otherwise  use  application octet-stream        mime type   MIME  Types type for filename  0     MIME  Types  application octet-stream   0        return  Content-Disposition  form-data  name     CGI  escape k      filename      filename     r n                  Content-Type     mime type simplified   r n r n   content   r n      end   end end

User · Answer

Ok  here s a simple example using curb   require  yaml  require  curb     prepare post data post data   fields hash map    k  v  Curl  PostField content k  v to s    post data  lt  lt  Curl  PostField file  file     path to file        post c   Curl  Easy new  http   localhost 3000 foo   c multipart form post   true c http post post data     print response y  c response code  c body str

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Well the solution with NetHttp has a drawback that is when posting big files it loads the whole file into memory first   After playing a bit with it I came up with the following solution   class Multipart    def initialize  file names        file names   file names   end    def post  to url       boundary    ----RubyMultipartClient    rand 1000000  to s    ZZZZZ       parts          streams           file names each do  param name  filepath        pos   filepath rindex            filename   filepath pos   1  filepath length - pos        parts  lt  lt  StringPart new    --    boundary     r n           Content-Disposition  form-data  name       param name to s        filename       filename       r n           Content-Type  video x-msvideo r n r n         stream   File open filepath   rb         streams  lt  lt  stream       parts  lt  lt  StreamPart new  stream  File size filepath       end     parts  lt  lt  StringPart new     r n--    boundary    -- r n         post stream   MultipartStream new  parts        url   URI parse  to url       req   Net  HTTP  Post new url path      req content length   post stream size     req content type    multipart form-data  boundary     boundary     req body stream   post stream     res   Net  HTTP new url host  url port  start   http  http request req         streams each do  stream        stream close        end      res   end  end  class StreamPart   def initialize  stream  size        stream   size   stream  size   end    def size      size   end    def read   offset  how much        stream read   how much     end end  class StringPart   def initialize   str        str   str   end    def size      str length   end    def read   offset  how much        str offset  how much    end end  class MultipartStream   def initialize  parts        parts   parts      part no   0       part offset   0    end    def size     total   0      parts each do  part        total    part size     end     total   end    def read   how much        if  part no  gt    parts size       return nil      end      how much current part    parts  part no  size -  part offset      how much current part   if how much current part  gt  how much       how much     else       how much current part     end      how much next part   how much - how much current part      current part    parts  part no  read  part offset  how much current part        if how much next part  gt  0        part no    1        part offset   0       next part   read   how much next part          current part   if next part         next part       else                  end     else        part offset    how much current part       current part     end   end end

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I can t say enough good things about Nick Sieger s multipart-post library   It adds support for multipart posting directly to Net  HTTP  removing your need to manually worry about boundaries or big libraries that may have different goals than your own   Here is a little example on how to use it from the README   require  net http post multipart   url   URI parse  http   www example com upload   File open    image jpg   do  jpg    req   Net  HTTP  Post  Multipart new url path       file    gt  UploadIO new jpg   image jpeg    image jpg     res   Net  HTTP start url host  url port  do  http      http request req    end end   You can check out the library here  http   github com nicksieger multipart-post  or install it with     sudo gem install multipart-post   If you re connecting via SSL you need to start the connection like this   n   Net  HTTP new url host  url port   n use ssl   true   for debugging dev server  n verify mode   OpenSSL  SSL  VERIFY NONE res   n start do  http

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Here is my solution after trying other ones available on this post  I m using it to upload photo on TwitPic     def upload photo       curl -F media    photo path  -F username    username  -F password    password  -F message    photo title   http   twitpic com api uploadAndPost    end

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Fast forward to 2017  ruby stdlib net http has this built-in since 1 9 3     Net  HTTPRequest set form   Added to support both application x-www-form-urlencoded and multipart form-data    https   ruby-doc org stdlib-2 3 1 libdoc net http rdoc Net HTTPHeader html method-i-set form  We can even use IO which does not support  size to stream the form data   Hoping that this answer can really help someone     P S  I only tested this in ruby 2 3 1

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The multipart-post gem works pretty well with Rails 4 Net  HTTP  no other special gem  def model params   require params   params require  model  permit  param one   param two   param three   avatar    require params  avatar    model params  avatar  present    UploadIO new model params  avatar  tempfile  model params  avatar  content type  model params  avatar  original filename    nil   require params end  require  net http post multipart   url   URI parse  http   www example com upload   Net  HTTP start url host  url port  do  http    req   Net  HTTP  Post  Multipart new url  model params    key    authorization key    req add field  Authorization   key   add to Headers   http use ssl    url scheme     https     http request req  end   https   github com Feuda multipart-post tree patch-1

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I like RestClient  It encapsulates net http with cool features like multipart form data   require  rest client  RestClient post  http   localhost 3000 foo       name of file param   gt  File new   path to file      It also supports streaming   gem install rest-client will get you started

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Well the solution with NetHttp has a drawback that is when posting big files it loads the whole file into memory first   After playing a bit with it I came up with the following solution   class Multipart    def initialize  file names        file names   file names   end    def post  to url       boundary    ----RubyMultipartClient    rand 1000000  to s    ZZZZZ       parts          streams           file names each do  param name  filepath        pos   filepath rindex            filename   filepath pos   1  filepath length - pos        parts  lt  lt  StringPart new    --    boundary     r n           Content-Disposition  form-data  name       param name to s        filename       filename       r n           Content-Type  video x-msvideo r n r n         stream   File open filepath   rb         streams  lt  lt  stream       parts  lt  lt  StreamPart new  stream  File size filepath       end     parts  lt  lt  StringPart new     r n--    boundary    -- r n         post stream   MultipartStream new  parts        url   URI parse  to url       req   Net  HTTP  Post new url path      req content length   post stream size     req content type    multipart form-data  boundary     boundary     req body stream   post stream     res   Net  HTTP new url host  url port  start   http  http request req         streams each do  stream        stream close        end      res   end  end  class StreamPart   def initialize  stream  size        stream   size   stream  size   end    def size      size   end    def read   offset  how much        stream read   how much     end end  class StringPart   def initialize   str        str   str   end    def size      str length   end    def read   offset  how much        str offset  how much    end end  class MultipartStream   def initialize  parts        parts   parts      part no   0       part offset   0    end    def size     total   0      parts each do  part        total    part size     end     total   end    def read   how much        if  part no  gt    parts size       return nil      end      how much current part    parts  part no  size -  part offset      how much current part   if how much current part  gt  how much       how much     else       how much current part     end      how much next part   how much - how much current part      current part    parts  part no  read  part offset  how much current part        if how much next part  gt  0        part no    1        part offset   0       next part   read   how much next part          current part   if next part         next part       else                  end     else        part offset    how much current part       current part     end   end end

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I had the same problem  need to post to jboss web server   Curb works fine for me  except that it caused ruby to crash  ruby 1 8 7 on ubuntu 8 10  when I use session variables in the code   I dig into the rest-client docs  could not find indication of multipart support  I tried the rest-client examples above but jboss said the http post is not multipart

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curb looks like a great solution  but in case it doesn t meet your needs  you can do it with Net  HTTP   A multipart form post is just a carefully-formatted string with some extra headers   It seems like every Ruby programmer who needs to do multipart posts ends up writing their own little library for it  which makes me wonder why this functionality isn t built-in   Maybe it is     Anyway  for your reading pleasure  I ll go ahead and give my solution here   This code is based off of examples I found on a couple of blogs  but I regret that I can t find the links anymore   So I guess I just have to take all the credit for myself     The module I wrote for this contains one public class  for generating the form data and headers out of a hash of String and File objects   So for example  if you wanted to post a form with a string parameter named  title  and a file parameter named  document   you would do the following    prepare the query data  headers   Multipart  Post prepare query  title    gt  my string   document    gt  my file    Then you just do a normal POST with Net  HTTP   http   Net  HTTP new upload uri host  upload uri port  res   http start   con  con post upload uri path  data  headers      Or however else you want to do the POST   The point is that Multipart returns the data and headers that you need to send   And that s it   Simple  right   Here s the code for the Multipart module  you need the mime-types gem      Takes a hash of string and file parameters and returns a string of text   formatted to be sent as a multipart form post      Author   Cody Brimhall  lt mailto brimhall somuchwit com gt    Created   22 Feb 2008   License   Distributed under the terms of the WTFPL  http   www wtfpl net txt copying    require  rubygems  require  mime types  require  cgi    module Multipart   VERSION    1 0 0       Formats a given hash as a multipart form post     If a hash value responds to  string or  read messages  then it is     interpreted as a file and processed accordingly  otherwise  it is assumed     to be a string   class Post       We have to pretend we re a web browser        USERAGENT    Mozilla 5 0  Macintosh  U  PPC Mac OS X  en-us  AppleWebKit 523 10 6  KHTML  like Gecko  Version 3 0 4 Safari 523 10 6      BOUNDARY    0123456789ABLEWASIEREISAWELBA9876543210      CONTENT TYPE    multipart form-data  boundary    BOUNDARY        HEADER      Content-Type    gt  CONTENT TYPE   User-Agent    gt  USERAGENT        def self prepare query params        fp             params each do  k  v            Are we trying to make a file parameter          if v respond to   path  and v respond to   read  then           fp push FileParam new k  v path  v read             We must be trying to make a regular parameter         else           fp push StringParam new k  v           end       end          Assemble the request body using the special multipart format       query   fp collect   p   --    BOUNDARY     r n    p to multipart   join        --    BOUNDARY    --        return query  HEADER     end   end    private      Formats a basic string key value pair for inclusion with a multipart post   class StringParam     attr accessor  k   v      def initialize k  v         k   k        v   v     end      def to multipart       return  Content-Disposition  form-data  name     CGI  escape k     r n r n  v  r n      end   end      Formats the contents of a file or string for inclusion with a multipart     form post   class FileParam     attr accessor  k   filename   content      def initialize k  filename  content         k   k        filename   filename        content   content     end      def to multipart         If we can tell the possible mime-type from the filename  use the         first in the list  otherwise  use  application octet-stream        mime type   MIME  Types type for filename  0     MIME  Types  application octet-stream   0        return  Content-Disposition  form-data  name     CGI  escape k      filename      filename     r n                  Content-Type     mime type simplified   r n r n   content   r n      end   end end

User · Answer

Ok  here s a simple example using curb   require  yaml  require  curb     prepare post data post data   fields hash map    k  v  Curl  PostField content k  v to s    post data  lt  lt  Curl  PostField file  file     path to file        post c   Curl  Easy new  http   localhost 3000 foo   c multipart form post   true c http post post data     print response y  c response code  c body str

User · Answer

Here is my solution after trying other ones available on this post  I m using it to upload photo on TwitPic     def upload photo       curl -F media    photo path  -F username    username  -F password    password  -F message    photo title   http   twitpic com api uploadAndPost    end

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Well the solution with NetHttp has a drawback that is when posting big files it loads the whole file into memory first   After playing a bit with it I came up with the following solution   class Multipart    def initialize  file names        file names   file names   end    def post  to url       boundary    ----RubyMultipartClient    rand 1000000  to s    ZZZZZ       parts          streams           file names each do  param name  filepath        pos   filepath rindex            filename   filepath pos   1  filepath length - pos        parts  lt  lt  StringPart new    --    boundary     r n           Content-Disposition  form-data  name       param name to s        filename       filename       r n           Content-Type  video x-msvideo r n r n         stream   File open filepath   rb         streams  lt  lt  stream       parts  lt  lt  StreamPart new  stream  File size filepath       end     parts  lt  lt  StringPart new     r n--    boundary    -- r n         post stream   MultipartStream new  parts        url   URI parse  to url       req   Net  HTTP  Post new url path      req content length   post stream size     req content type    multipart form-data  boundary     boundary     req body stream   post stream     res   Net  HTTP new url host  url port  start   http  http request req         streams each do  stream        stream close        end      res   end  end  class StreamPart   def initialize  stream  size        stream   size   stream  size   end    def size      size   end    def read   offset  how much        stream read   how much     end end  class StringPart   def initialize   str        str   str   end    def size      str length   end    def read   offset  how much        str offset  how much    end end  class MultipartStream   def initialize  parts        parts   parts      part no   0       part offset   0    end    def size     total   0      parts each do  part        total    part size     end     total   end    def read   how much        if  part no  gt    parts size       return nil      end      how much current part    parts  part no  size -  part offset      how much current part   if how much current part  gt  how much       how much     else       how much current part     end      how much next part   how much - how much current part      current part    parts  part no  read  part offset  how much current part        if how much next part  gt  0        part no    1        part offset   0       next part   read   how much next part          current part   if next part         next part       else                  end     else        part offset    how much current part       current part     end   end end

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restclient did not work for me until I overrode create file field in RestClient  Payload  Multipart   It was creating a  Content-Disposition  multipart form-data  in each part where it should be    Content-Disposition  form-data      http   www ietf org rfc rfc2388 txt  My fork is here if you need it  git github com kcrawford rest-client git

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Fast forward to 2017  ruby stdlib net http has this built-in since 1 9 3     Net  HTTPRequest set form   Added to support both application x-www-form-urlencoded and multipart form-data    https   ruby-doc org stdlib-2 3 1 libdoc net http rdoc Net HTTPHeader html method-i-set form  We can even use IO which does not support  size to stream the form data   Hoping that this answer can really help someone     P S  I only tested this in ruby 2 3 1

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Another one using only standard libraries   uri   URI  https   some end point some path   request   Net  HTTP  Post new uri  request  Authorization      If you need some headers  form data      photos   photo tempfile     or File open   in case of local file  request set form form data   multipart form-data  response   Net  HTTP start uri hostname  uri port  use ssl  true  do  http    pay attention to use ssl if you need it   http request request  end   Tried a lot of approaches but only this was worked for me

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Here is my solution after trying other ones available on this post  I m using it to upload photo on TwitPic     def upload photo       curl -F media    photo path  -F username    username  -F password    password  -F message    photo title   http   twitpic com api uploadAndPost    end

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I had the same problem  need to post to jboss web server   Curb works fine for me  except that it caused ruby to crash  ruby 1 8 7 on ubuntu 8 10  when I use session variables in the code   I dig into the rest-client docs  could not find indication of multipart support  I tried the rest-client examples above but jboss said the http post is not multipart

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I can t say enough good things about Nick Sieger s multipart-post library   It adds support for multipart posting directly to Net  HTTP  removing your need to manually worry about boundaries or big libraries that may have different goals than your own   Here is a little example on how to use it from the README   require  net http post multipart   url   URI parse  http   www example com upload   File open    image jpg   do  jpg    req   Net  HTTP  Post  Multipart new url path       file    gt  UploadIO new jpg   image jpeg    image jpg     res   Net  HTTP start url host  url port  do  http      http request req    end end   You can check out the library here  http   github com nicksieger multipart-post  or install it with     sudo gem install multipart-post   If you re connecting via SSL you need to start the connection like this   n   Net  HTTP new url host  url port   n use ssl   true   for debugging dev server  n verify mode   OpenSSL  SSL  VERIFY NONE res   n start do  http

[ruby] Ruby: How to post a file via HTTP as multipart/form-data?

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