Styjun

I'm using rn-fetch-blob library to download and save a file into the device, and I've been successful to do it with GET request like: .fetch('GET', "http://api.pdflayer.com/api/convert?access_key=MY_ACCESS_KEY&document_url=URL_PATH"), but the API that I use just accepts post request, so I tried this but didn't work:

const config, fs = RNFetchBlob;
let DownloadDir = fs.dirs.DownloadDir;
let options = 
 fileCache: true,
 addAndroidDownloads : 
 useDownloadManager : true,
 path: DownloadDir + "/file.pdf"
 
;
const data = JSON.stringify(
 access_key: "MY_ACCESS_KEY",
 document_url: "https://pdflayer.com/downloads/invoice.html"
);
config(options)
 .fetch('POST', 'http://api.pdflayer.com/api/convert', body: data)
 .then((res) => 
 console.log(res);
 )
 .catch((err) => 
 console.log(err)
 )

If I'm not sending my request correctly, so how should I do it? thanks in advance.

According to the rn-fetch-blob's document :

headers:object (Optional) Headers of HTTP request, the value of
headers should be stringified, if you're uploading binary files,
content-type should be application/octet-stream or
multipart/form-data(see examples above).

body:string | Array (Optional) Body of the HTTP request, body
can either be a BASE64 string, or an array contains object elements,
each element have 2 required property name, data, and optional
property filename, once filename is set, content in data property will
be considered as a path to a file or a BASE64 string which will be
converted into byte array later.

I think you should define content-type for your request and change your code like these examples :

// Post binary data using base64 encoding
RNFetchBlob.fetch('POST', 'http://myupload.com/upload', 
 'Content-Type' : 'application/octet-stream' 
 , RNFetchBlob.base64.encode(mydata))

// Post binary data from existing file
RNFetchBlob.fetch('POST', 'http://myupload.com/upload', 
 'Content-Type' : 'application/octet-stream' 
 , RNFetchBlob.wrap(path_to_the_file))

// Post form data 
RNFetchBlob.fetch('POST', 'http://myupload.com/upload', 
 'Content-Type' : 'multipart/form-data' 
 , [
 name : 'user_name', data : 'Bill' ,
 // binary field data from a file path, use `wrap` method to wrap the path
 name : 'avatar', filename : 'avatar.jpg', data : RNFetchBlob.wrap(path_to_the_file) ,
 // binary field data encoded in BASE64
 name : 'pet-avatar', filename : 'pet-avatar.jpg', data : RNFetchBlob.base64.encode(image_data) ,
 ])

I hope that helps :)