I'm trying to POST a multipart/form-data using Spring RestTemplate with a byte array as the file to upload and it keeps failing (Server rejects with different kinds of errors).
I'm using a MultiValueMap with ByteArrayResource. Is there something I'm missing?
Yes there is something missing.
I have found this article:
The author mentions that in order to POST a byte array using Spring RestTemplate one needs to override getFileName() of the ByteArrayResource.
Here is the code example from the article:
private static void uploadWordDocument(byte[] fileContents, final String filename) {
RestTemplate restTemplate = new RestTemplate();
String fooResourceUrl = "http://localhost:8080/spring-rest/foos"; // Dummy URL.
MultiValueMap<String, Object> map = new LinkedMultiValueMap<String, Object>();
map.add("name", filename);
map.add("filename", filename);
// Here we
ByteArrayResource contentsAsResource = new ByteArrayResource(fileContents) {
@Override
public String getFilename() {
return filename; // Filename has to be returned in order to be able to post.
}
};
map.add("file", contentsAsResource);
// Now you can send your file along.
String result = restTemplate.postForObject(fooResourceUrl, map, String.class);
// Proceed as normal with your results.
}
I tried it and it works!
byte array using Spring RestTemplate one needs to override getFileName() of the ByteArrayResource
I added an issue to send a request from java client to Python service in FastApi and sending a ByteArrayResource instaead of simple byte[] fixed the issue. FastAPI server returned: "Expected UploadFile, received: <class 'str'>","type":"value_error""
