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How to send a Request Body in GET method using the Java 11 HttpClient library?

I have to request data from an API but the API needs a JSON in the request body and it has to be sent using the GET method. My project uses the Java 11 HttpClient library so I want solutions that only include using this library. How do I send the body in GET method?
HttpRequest request = HttpRequest.newBuilder(uri)
.header("Content-Type", "application/json")
.GET(BodyPublishers.ofString(jsonObject.toString()))
.build();
HttpClient client = AppHttpClient.getInstance();
HttpResponse<String> response = client.send(request, BodyHandlers.ofString());

Code issue
Builder class doesn't have a predefined GET method with the ability to pass request body. In this case just use more generic approach:
HttpRequest request = HttpRequest.newBuilder(uri)
.header("Content-Type", "application/json")
.method("GET", BodyPublishers.ofString(jsonObject.toString()))
.build();
HttpClient client = AppHttpClient.getInstance();
HttpResponse<String> response = client.send(request, BodyHandlers.ofString());
General
Usually, passing body in the GET request is not recommended, so I would recommend reconsidering your API design. Instead of a body, you can use URL query parameters or think about using the POST method if the request body is quite big and can't be mapped to the query parameters.

Sending an authorised post request using RequestBuilder and HttpUriRequest

I want to send a post request which has a bearer authorization required in java. The body of the post request takes parameters of in the following json format in postman:
{
"name": "project-002",
"description": "Test number 2",
"users": [
"ppallavalli#umass.edu"
]
}
I want to send a post request in the following way by which i executed my get request which needed authorization because authorization easier this way.
HttpUriRequest httpGet = RequestBuilder.get().setUri("https://sandbox.predera.com/aiq/api/projects/a-443018111").setHeader(HttpHeaders.AUTHORIZATION,authHeader).build();
In specific i want to send a post request using HttpUriRequest and RequestBuilder.post because authorization is easier in this case especially because the authorization required in my case is a Bearer token. Also, in the above request execution, auth header is string i have already initialized to a Bearer authorization token

You can use RequestBuilder.post() to build a POST request with a StringEntity to pass your JSON String. Rest of the headers including Authorization etc. should remain same.
String url = "https://sandbox.predera.com/aiq/api/projects/a-443018111";
String jsonString = "{...}";
HttpUriRequest httpPost = RequestBuilder.post(url).setHeader(HttpHeaders.CONTENT_TYPE, "application/json").addHeader(HttpHeaders.AUTHORIZATION, authHeader).setEntity(new StringEntity(jsonString)).build();
...

Modifying Sharepoint List From External Web Application REST API

I am attempting to modify items in a Sharepoint list using the Sharepoint REST API from back-end java code. I am using NTLM authentication to access the server and Apache httpclient to perform the http requests. I am able to perform a GET request to the list URL without issue, but when doing a POST request, I am receiving an error:
The type SP.ListItemEntityCollection does not support HTTP PATCH
method
Here is the relevant code for the POST request:
JsonObject type = new JsonObject();
type.addProperty("type", "SP.Data.MyListListItem");
JsonObject listJson2 = new JsonObject();
listJson2.add("__metadata", type);
listJson2.addProperty("Title", "test");
String backToString = listJson2.toString();
CloseableHttpClient httpClient2 = HttpClients.createDefault();
HttpPost httpPost2 = new HttpPost(LIST_URL);
httpPost2.setEntity(new StringEntity(backToString));
httpPost2.addHeader("X-RequestDigest", formDigestValue);
httpPost2.addHeader("Content-Type", "application/json;odata=verbose");
httpPost2.addHeader("Accept", "application/json;odata=verbose");
httpPost2.addHeader("X-HTTP-Method", "MERGE");
httpPost2.addHeader("IF_MATCH", "*");
CloseableHttpResponse response2 = httpClient2.execute(httpPost2, context);
Am I doing something wrong here? I am following the post request from https://dev.office.com/sharepoint/docs/sp-add-ins/working-with-lists-and-list-items-with-rest.

Get all the headers for HttpPost with entity

I'm using HttpClient to send a PUT request with a body to Azure.
The body is represented by a StringEntity.
I need to add the Azure authentication signature to the request, and in order to compute it correctly I need the values of the Content-Type and Content-Length headers.
When call the setEntity() method on the HttpPost request, no headers are added to the request, but using a HTTP debugging proxy I can see that they are correctly sent with the request.
From the Apache documentation (here) I saw I could use entity.getContentLength() and entity.getContentType() to compute those, but I would prefer to extract the data directly from the HttpPost if possible.
Anyone knows a way to force the entity to add the headers to the request, before the request is executed?
This is the code I'm using
HttpPut createBlob = new HttpPut(createBlobUrl);
createBlob.addHeader("x-ms-blob-type", "BlockBlob");
createBlob.addHeader("x-ms-date", utcTime);
createBlob.addHeader("x-ms-version", "2015-04-05");
HttpEntity body = new StringEntity("test blob", "UTF-8");
createBlob.setEntity(body);
// h is missing Content-Length and Content-Type
Header[] h = createBlob.getAllHeaders();
resp = httpclient.execute(createBlob);

I found a solution for it.
Adding an interceptor to the client, I can get the complete request with all the headers just before it's executed, so I don't need to deal with special cases where the headers are added by the entity.
HttpClientBuilder builder = HttpClientBuilder.create();
builder = builder.disableContentCompression().disableConnectionState();
builder.addInterceptorLast((HttpRequestInterceptor) (request, context) -> {
try {
SignRequest(request, account, secret);
}
catch (Exception e) {
}
});
HttpClient httpclient = builder.build();
Official tutorial about interceptor can be found at this link

Making a HTTP POST SOAP request with JSON

I am making a SOAP request to a web method using HTTP Post. The request and response are both JSON.
But while making the POST request i am getting an error :
The server cannot service the request because the media type is
unsupported.
This is my code
String SOAP_ACTION = "Method name";
String URL = "service url";
HttpPost httpPost = null;
httpPost = new HttpPost(URL);
httpPost.addHeader("Accept-Encoding", "gzip,deflate");
httpPost.addHeader("Content-Type", "application/json; charset=UTF-8");
httpPost.addHeader("SOAPAction", SOAP_ACTION);
HttpEntity postEntity = new StringEntity(requestContent);
httpPost.setEntity(postEntity);
I have tried giving Accept-Encoding as application/json , text. But i still get the same error.

SOAP is an XML-based protocol. See https://en.wikipedia.org/wiki/SOAP and the W3C SOAP Primer.
If you want to communicate using JSON, that's fine - but it isn't SOAP.