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How to make an HTTP request in Java and ignore the body

To be more specific, I mean specifically to just consume the HTTP headers over the network and stop the communication before the client receives the response body.
Example
Client makes a request
GET / HTTP/1.1
Host: example.com
Connection: Keep-Alive
User-Agent: Apache-HttpClient/UNAVAILABLE (Java/1.8.0_262)
Accept-Encoding: gzip,deflate
Then the response over the network is just
HTTP/1.1 200 OK
Date: Wed, 23 Sep 2020 22:41:21 GMT
Server: Apache
Expires: Sun, 19 Nov 1978 05:00:00 GMT
Cache-Control: public, max-age=10800
Content-Language: en
Vary: Cookie,Accept-Encoding
Content-Encoding: gzip
Content-Type: text/html; charset=utf-8
Age: 1865
grace: none
Content-Length: 9213
Connection: keep-alive
Accept-Ranges: bytes

Http protocol has six method, one of the methods is 'HEAD'. You can try use HEAD method instead of GET method.
And another stupid way : declare a web interface, and return null string.Like this:
// a web interface
String result = "";
return result;

Spring Boot returns "200 OK" (Empty Response) for resource directory, not file

I am building a basic Spring Boot app, using the built is resource handler.
registry.addResourceHandler("/**")
.addResourceLocations("classpath:/public/")
.setCachePeriod(60 * 60 * 24 * 365)
.resourceChain(true)
.addResolver(versionResourceResolver);
The file structure is as follows:
src
main
java
..
resources
public
js
app.js
Making a request to localhost:8080/js/app.js works as expected, returning the contents of the file with the correct MIME type.
However, making a request to the container directory also returns 200 OK and an empty response!
$ curl -v http://localhost:8080/js/
* Trying ::1...
* Connected to localhost (::1) port 8080 (#0)
> GET /js/ HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.49.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Date: Mon, 28 Nov 2016 21:13:26 GMT
< X-Application-Context: application
< Last-Modified: Mon, 28 Nov 2016 21:06:28 GMT
< Cache-Control: max-age=31536000
< Accept-Ranges: bytes
< Content-Type: application/octet-stream
< Content-Length: 0
<
* Connection #0 to host localhost left intact
How can I get this to return 404 Not Found instead? It's not a huge issue, but definitely not what I'd expected.

Jersey ExceptionMapper implementations skipped on deploy

In my pet project I have a simple jersey (v 2.13) resource that performs some crud operations, and the input is validated by hibernate-validator (v 5.0.1.Final).
The problem is that while the junit tests works as expected, when I deploy the webapp all the ExceptionMapper implementations are ignored.
Here some details:
#POST
#Consumes(MediaType.APPLICATION_JSON)
#Produces(MediaType.APPLICATION_JSON)
public JsonResult<User> addUser(#Valid Userbean user) {
//do stuff...
}
The validation is made by hibernate-validator.
the Userbean is annotate with:
#NotNull
private String password;
I've created an ExceptionMapper implementation:
#Provider
public class ValidationExceptionMapper implements ExceptionMapper<ValidationException> {
#Override
public Response toResponse(ValidationException e) {
return Response.status(422).build();
}
}
Leaving aside that on validation the proper status code should be 400, my problem is that while in my junit-test everything goes fine...
Userbean entity = new Userbean();
entity.setUsername(username);
Response response = target.path("users").request(MediaType.APPLICATION_JSON).post(Entity.json(entity));
int status = response.getStatus();
assertEquals(422 status);
...I cannot reproduce the same behaviour when I run it on tomcat (I've tried tomcat7 / tomcat 8 and also glassfish 4.1)
I always get a 400 status code instead of 422 and ValidationExceptionMapper is being skipped.
$ curl -v -X POST -H "Content-Type: application/json" --data "{\"username\":\"MrFoo\"}" http://localhost:8080/playground-webapp/jaxrs/jersey/users/
* About to connect() to localhost port 8080 (#0)
* Trying ::1... connected
> POST /playground-webapp/jaxrs/jersey/users/ HTTP/1.1
> User-Agent: curl/7.22.0 (x86_64-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3
> Host: localhost:8080
> Accept: */*
> Content-Type: application/json
> Content-Length: 20
>
* upload completely sent off: 20out of 20 bytes
< HTTP/1.1 400 Bad Request
< Server: Apache-Coyote/1.1
< Content-Type: text/html;charset=utf-8
< Content-Language: en
< Content-Length: 990
< Date: Sun, 28 Dec 2014 15:07:34 GMT
< Connection: close
<
* Closing connection #0
<html><head><title>Apache Tomcat/7.0.52 - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 400 - Bad Request</h1><HR size="1" noshade="noshade"><p><b>type</b> Status report</p><p><b>message</b> <u>Bad Request</u></p><p><b>description</b> <u>The request sent by the client was syntactically incorrect.</u></p><HR size="1" noshade="noshade"><h3>Apache Tomcat/7.0.52</h3></body></html>
The same call made on the test server works as expected:
curl -v -X POST -H "Content-Type: application/json" --data "{\"username\":\"MrFoo\"}" http://localhost:8080/users/
* About to connect() to localhost port 8080 (#0)
* Trying ::1... Connessione rifiutata
* Trying 127.0.0.1... connected
> POST /users/ HTTP/1.1
> User-Agent: curl/7.22.0 (x86_64-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3
> Host: localhost:8080
> Accept: */*
> Content-Type: application/json
> Content-Length: 20
>
* upload completely sent off: 20out of 20 bytes
< HTTP/1.1 422
< Content-Type: application/json
< Date: Sun, 28 Dec 2014 15:05:35 GMT
< Content-Length: 94
<
* Connection #0 to host localhost left intact
the code of the server I use for junit is:
#Before
public void setUpClient() throws Exception {
ResourceConfig rc = new UserResourceConfig();
rc.property("contextConfig", appContext);
server = GrizzlyHttpServerFactory.createHttpServer(BASE_URI, rc);
server.start();
....
Thanks in advance for your help.

google drive sdk error uploading presentations

I'm trying to upload a presentation, using the google api drive, but the presentation goes incomplete some slides are blank, watching the logs this is what shows
com.google.api.client.http.HttpRequest execute: -------------- REQUEST --------------
PUT https://www.googleapis.com/upload/drive/v2/files? uploadType=resumable&upload_id=AEnB2UrDPJgLIehcqH--aWgwl- R_atDhqdvbXnJiWMXKE0V0euJGOvULbM4y5YmvUePWaHSrYyFdOgsmTASJGe-Dtvg09NCkzQ
Accept-Encoding: gzip
Authorization: Bearer ya29.AHES6ZTfSaK77NGCcZO1bK_aTbT8zVX3eslOAb8BkrvpeXARK94XsXY
Content-Range: bytes 0-1048575/6774302
User-Agent: Google-HTTP-Java-Client/1.11.0-beta (gzip)
Content-Type: application/vnd.openxmlformats-officedocument.presentationml.presentation
Content-Length: 1048576
com.google.api.client.http.HttpRequest execute: curl -v --compressed -X PUT -H 'Accept- Encoding: gzip' -H 'Authorization: Bearer ya29.AHES6ZTfSaK77NGCcZO1bK_aTbT8zVX3eslOAb8BkrvpeXARK94XsXY' -H 'Content-Range: bytes 0- 1048575/6774302' -H 'User-Agent: Google-HTTP-Java-Client/1.11.0-beta (gzip)' -H 'Content-Type: application/vnd.openxmlformats-officedocument.presentationml.presentation' -d '#-' -- https://www.googleapis.com/upload/drive/v2/files? uploadType=resumable&upload_id=AEnB2UrDPJgLIehcqH--aWgwl- R_atDhqdvbXnJiWMXKE0V0euJGOvULbM4y5YmvUePWaHSrYyFdOgsmTASJGe-Dtvg09NCkzQ << $$$
com.google.api.client.http.HttpResponse <init>: -------------- RESPONSE --------------
308 OK
server: HTTP Upload Server Built on Oct 3 2012 16:52:30 (1349308350)
range: bytes=0-1048575
x-range-md5: 19230c1c1a0fc493f3431f46cf30c14c
date: Mon, 05 Nov 2012 22:00:33 GMT
pragma: no-cache
expires: Fri, 01 Jan 1990 00:00:00 GMT
cache-control: no-cache, no-store, must-revalidate
content-length: 0
content-type: text/html; charset=UTF-8
x-google-cache-control: remote-fetch
via: HTTP/1.1 GWA
and this is the code that am using:
byte[] myFile = readImageData(blobKey,size);
ByteArrayContent mediaContent = new ByteArrayContent(mimeType, myFile);
Drive.Files.Insert insert = service.files().insert(body, mediaContent);
insert.getMediaHttpUploader().setChunkSize(1024 * 1024);
File file = insert.execute();
UPDATE
doing some testing, it seems the error only occurs when upload presentations with extension .pptx
is there any problem with the mimeType of that extension?
I hope someone can help me, thx in advance.

It seems like the resumable upload protocol is not being implemented correctly. The 308 response code indicates that only a chunk of the request has been uploaded and you should proceed with the next chunk.
Does it work correctly if you remove the following line from your code?
insert.getMediaHttpUploader().setChunkSize(1024 * 1024);

i have a very strange issue, url getting appended by / in query string

Below is the url using in my code
URL url = new URL("https://8.7.177.4/ns-api?object=answerrule&action=read&domain=amj.nms.mixnetworks.net&user=9001");
but iam getting exception as
java.io.FileNotFoundException: https://8.7.177.4/ns-api/?object=answerrule&action=read&domain=amj.nms.mixnetworks.net&user=9001
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
at AuthenticateCurl.authenticatenewPostUrl(AuthenticateCurl.java:311)
at AuthenticateCurl.main(AuthenticateCurl.java:341)
in the exception we can find url where /?object=answerrule is getting appended before starting query string.
How can i resolve this.

When you access the url without the extra '/', the web server forwards you to the version that has the extra '/'. You can see this when attempting to curl the URL at the command line:
$ curl --insecure -v 'https://8.7.177.4/ns-api?object=answerrule&action=read&domain=amj.nms.mixnetworks.net&user=9001'
> GET /ns-api?object=answerrule&action=read&domain=amj.nms.mixnetworks.net&user=9001 HTTP/1.1
> User-Agent: curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5
> Host: 8.7.177.4
> Accept: */*
>
< HTTP/1.1 301 Moved Permanently
< Date: Thu, 12 Jul 2012 18:45:28 GMT
< Server: Apache/2.2.11 (Fedora)
< Location: https://8.7.177.4/ns-api/?object=answerrule&action=read&domain=amj.nms.mixnetworks.net&user=9001
< Content-Length: 392
< Connection: close
< Content-Type: text/html; charset=iso-8859-1
<
This is fine, and HttpURLConnection automatically follows the redirect to the new URL. This is normal behaviour.
Following the new URL, we get a different result:
$ curl --insecure -v 'https://8.7.177.4/ns-api/?object=answerrule&action=read&domain=amj.nms.mixnetworks.net&user=9001'
> GET /ns-api/?object=answerrule&action=read&domain=amj.nms.mixnetworks.net&user=9001 HTTP/1.1
> User-Agent: curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5
> Host: 8.7.177.4
> Accept: */*
>
< HTTP/1.1 404 Not Found
< Date: Thu, 12 Jul 2012 18:46:46 GMT
< Server: Apache/2.2.11 (Fedora)
< X-Powered-By: PHP/5.2.9
< Content-Length: 0
< Connection: close
< Content-Type: text/html; charset=UTF-8
<
...And we get a 404, which is why you get a FileNotFoundException!
If you were not expecting a redirect and you are running the server as well, maybe there is a configuration problem on the server.