Override the method of packing HTTP form-urlencoded parameters in Meteor HTTP call - http

Question

I'm using Meteor to consume a remote API. One of the endpoints of this API requires an (ordered) array of credentials, so the data would look like
{
"country": "de",
"credentials": ["admin", "password"],
"whatever": "whatever"
}
When I provide this plain-object as the value to param property of HTTP.post like this
HTTP.post('https://api.whatever.org/whatever', {
headers: {
"Authorization": "Basic ".concat(...)
},
params: {
"country": "de",
"credentials": ["admin", "password"],
"whatever": "whatever"
}
});
then the parameters are packed this way:
country=de
credentials=admin,password
whatever=whatever
but they should be packed this way:
country=de
credentials=admin
credentials=password
whatever=whatever
I tried using a Content-Type header but it didn't help.
I tried using content and data instead of params with different outcomes and then ended concatenating all the values into a query string an putting it into content property. But this isn't really a nice piece of code and surely not one that is easy to maintain.
I've read docs but haven't found anything that would help.
Where should I look for the information regarding this topic? Is there a better way to override the way HTTP.post (or, in general, HTTP.call) computes the body of the query to send?

Answer 1

Where should I look for the information regarding this topic?
In the source code.
I know nothing about Meteor, but I’m looking into its source code and I see no public hook which could help you. Of course, you can replace URL._encodeParams with your own function, but that is less maintainable than submitting the encoded params as raw data.