/Crystal 0.31

class HTTP::FormData::Builder


Builds a multipart/form-data message.


require "http"

io = IO::Memory.new
builder = HTTP::FormData::Builder.new(io, "aA47")
builder.field("name", "joe")
file = IO::Memory.new("file contents")
builder.file("upload", file, HTTP::FormData::FileMetadata.new(filename: "test.txt"))
io.to_s # => "--aA47\r\nContent-Disposition: form-data; name=\"name\"\r\n\r\njoe\r\n--aA47\r\nContent-Disposition: form-data; name=\"upload\"; filename=\"test.txt\"\r\n\r\nfile contents\r\n--aA47--"

Defined in:



Instance Method Summary

Constructor Detail

def self.new(io : IO, boundary = MIME::Multipart.generate_boundary)Source

Creates a new FormData::Builder which writes to io, using the multipart boundary boundary.

Instance Method Detail

def boundary : StringSource

def content_typeSource

Returns a content type header with correct boundary parameter.

builder = HTTP::FormData::Builder.new(io, "a4VF")
builder.content_type # => "multipart/form-data; boundary=\"a4VF\""

def field(name : String, value, headers : HTTP::Headers = HTTP::Headers.new)Source

Adds a form part with the given name and value. Headers can optionally be provided for the form part.

def file(name : String, io, metadata : FileMetadata = FileMetadata.new, headers : HTTP::Headers = HTTP::Headers.new)Source

Adds a form part called name, with data from io as the value. Metadata can be provided to add extra metadata about the file to the Content-Disposition header for the form part. Other headers can be added using headers.

def finishSource

Finalizes the multipart message, this method must be called before the generated multipart message written to the IO is considered valid.

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Licensed under the Apache License, Version 2.0.