Is it possible to attach file in POST Json?

问题

I have a heap of data in format JSON(Serialized object). I send this data to server by POST method with header: Content-Type: application/json.

Is it possible to attach file to body request and send at once. Or JSON data sugggests sending only text data?

回答1:

Try to send the file inside the json object as a base64 string:

{
"file":"dGhpcyBpcyBhIGZpbGUgc2FtcGxl..." 
}

Later you can open the file with something like:

document.location = 'data:application/pdf;base64,' + file

回答2:

In this context, the content-type header aims to describe the type of data in the request body. If you use application/json the server will expect a JSON body.

If your goal is to send a single request with a JSON object and a file, you can either encode the file in the JSON structure (Probably base64. See: Binary Data in JSON String. Something better than Base64)

{
  ...
  file: "encoded_content",
  ...
}

Or you can use the content type multipart/form-data. A multipart is a part containing other part. The first subpart may be the JSON strucuture. The second one may be the file

来源：https://stackoverflow.com/questions/45264447/is-it-possible-to-attach-file-in-post-json