Multipart

This doc details what emitters will generate for multipart request.

Common multipart request

When content-type of operation is “multipart/form-data”, the body payload is multipart payload.

TypeSpec

model Address {
  city: string;
}
model MultipartRequest {
  id: string;
  address: Address;
  profileImage: bytes;
  pictures: bytes[];
}

@post
op upload(
  @header contentType: "multipart/form-data",
  @body body: MultipartRequest,
): NoContentResponse;

Python

class MultipartRequest:
    id: str = rest_field()
    address: "Address" = rest_field()
    profile_image: FileType = rest_field(name="profileImage", is_multipart_file_input=True)
    pictures: List[FileType] = rest_field(is_multipart_file_input=True)

def upload(
    self, body: Union[_models.MultipartRequest, JSON], **kwargs: Any
) -> None:

CSharp

Typescript

Java

// Model class
@Immutable
public final class MultipartRequest {
    public MultipartRequest(String id, Address address, ProfileImageFileDetails profileImage, List<PicturesFileDetails> pictures);
}

// Client API
public void upload(MultipartRequest body);

Multipart request with @multipartBody

With @multipartBody, typespec author could define part of multipart request with more detailed info. For example, typespec author could use File model predefined in @typespec/http to declare the requiredness of filename and contentType.

TypeSpec

model Address {
  city: string;
}
model MultipartRequest {
  id: HttpPart<string>;
  address: HttpPart<Address>;
  profileImage: HttpPart<File>;
  previousAddresses: HttpPart<Address[]>;
  pictures: HttpPart<File>[];
}

@post
op upload(
  @header contentType: "multipart/form-data",
  @multipartBody body: MultipartRequest,
): NoContentResponse;

Python

class MultipartRequest:
    id: str = rest_field()
    address: "Address" = rest_field()
    profile_image: FileType = rest_field(name="profileImage", is_multipart_file_input=True)
    pictures: List[FileType] = rest_field(is_multipart_file_input=True)

def upload(
    self, body: Union[_models.MultipartRequest, JSON], **kwargs: Any
) -> None:

CSharp

Typescript

Java

// Model class
@Immutable
public final class MultipartRequest {
    public MultipartRequest(String id, Address address, FileDetails profileImage, List<Address> previousAddresses, List<FileDetails> pictures);
}

// Client API
public void upload(MultipartRequest body);