I am trying to send the content-type in my superagent post request to multipart/form-data.
var myagent = superagent.agent();
myagent
.post(\'http://localhost/
Here is what worked for me. I had a single field form, that was uploading a file. I turned the form into a HTML5 FormData element and then did it as follows:
var frm = new FormData(document.getElementById('formId'));
var url = 'url/here';
superagent.post(url)
.attach('fieldInFormName', frm.get('fieldInFormName'))
.end( function (error, response) {
//handle response
});
Please note, I tried various ways of setting the 'Content-Type' manually in superagent, and it never worked correctly because of the multipart identifier needed in the Content-Type.
First, you do not mention either of the following:
.set('Content-Type', 'multipart/form-data')
OR
.type('form')
Second, you do not use the .send
, you use .field(name, value)
.
Let's say you wanted to send a form-data request with the following:
name
and phone
photo
So your request will be something like this:
superagent
.post( 'https://example.com/api/foo.bar' )
.set('Authorization', '...')
.accept('application/json')
.field('name', 'My name')
.field('phone', 'My phone')
.attach('photo', 'path/to/photo.gif')
.then((result) => {
// process the result here
})
.catch((err) => {
throw err;
});
And, let's say you wanted to send JSON as a value of one of your fields, then you'd do this.
try {
await superagent
.post( 'https://example.com/api/dog.crow' )
.accept('application/json')
.field('data', JSON.stringify({ name: 'value' }))
}
catch ( ex ) {
// .catch() stuff
}
// .then() stuff...
Try
.type('form')
instead of
.set('Content-Type', 'multipart/form-data')
See http://visionmedia.github.io/superagent/#setting-the-content-type
It is not clear what is in the fields
variable that you are sending, but here is some information that may help you determine where your problem lies.
To begin with, if you are actually trying to build a multi-part request, this is the official documentation for doing so: http://visionmedia.github.com/superagent/#multipart-requests
as for the error that you got...
The reason is that during the process of preparing the request, SuperAgent checks the data to be sent to see if it is a string. If it is not, it attempts to serialize the data based on the value of the 'Content-Type', as seen below:
exports.serialize = {
'application/x-www-form-urlencoded': qs.stringify,
'application/json': JSON.stringify
};
which is used here:
// body
if ('HEAD' != method && !req._headerSent) {
// serialize stuff
if ('string' != typeof data) {
var serialize = exports.serialize[req.getHeader('Content-Type')];
if (serialize) data = serialize(data);
}
// content-length
if (data && !req.getHeader('Content-Length')) {
this.set('Content-Length', Buffer.byteLength(data));
}
}
this means that to set a form 'Content-Type' manually you would use
.set('Content-Type', 'application/x-www-form-urlencoded')
or
.type('form')
as risyasin mentioned
any other 'Content-Type' will not be serialized, and Buffer.byteLength(data)
will subsequently throw the TypeError: Argument must be a string
exception if the value of your fields
variable is not a string.