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How to do non-GET requests on your own API

I followed this guide to create my own REST API. I am trying to consume my API that I built from the guide but I ran into some trouble when it came to using any request that wasn't a GET request. When I tried doing a delete request. (http://localhost:8080/api/v1/employees/3)
I would get a 405 error and I'm not sure why (I do not have any password protection in my local host). I want to understand how I can create requests other than GET. I tried using query parameters for my POST request, but it was unsuccessful.
I looked at all the other StackOverFlow Similar Questions and I couldn't find anything.
EDIT1: I am using a simple Java Application to do this.
This was the code I used in order to do my GET requests
String urlString = "http://localhost:8080/api/v1/employees";
try {
String result = "";
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
BufferedReader rd = new BufferedReader (new InputStreamReader(conn.getInputStream()));
String line;
while ((line = rd.readLine()) != null) {
result += line;
}
rd.close();
System.out.println(result);
}

Try to replace this URLConnection conn = url.openConnection();
to this:
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");

you can use org.springframework.web.client.RestTemplate (rest-template) to consume rest api.
for delete, you can do something like
private void deleteEmployee() {
Map < String, String > params = new HashMap < String, String > ();
params.put("id", "1");
RestTemplate restTemplate = new RestTemplate();
restTemplate.delete(DELETE_EMPLOYEE_ENDPOINT_URL, params);
}
please check https://www.javaguides.net/2019/06/spring-resttemplate-get-post-put-and-delete-example.html and https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/client/RestTemplate.html and https://www.baeldung.com/rest-template
hope these provide enough info

Google custom image search returns bad images

I want to get images from the Google Custom Search API. My problem is that Iam getting very weird images and no matter what I change in the settings.
keywords: empty
edition: free, with ads
image search: on
safe search: off
speech input: off
language: english
sites to search: -
restrictions: empty
search entire web: on
(Sorry if something is wrong translated, my UI is in german).
Some other user also had this problem but his solution didnt help me. Google custom search - poor image results
So no matter what I change in the settings, Iam getting the same images.
If I search "apfel" (english: apple) Iam getting this image link:
https://scontent-atl3-1.cdninstagram.com/v/t51.2885-19/s150x150/31514744_140795226776868_4684314220345425920_n.jpg?_nc_ht=scontent-atl3-1.cdninstagram.com&_nc_ohc=FdhVBUbROnkAX9AJdVR&oh=ea552d4c8b23acd0a3c82d83632e0895&oe=5ECA7F0E
But when I search it in the UI I get this:
It should not be the issue but here the code:
public static void main(String[] args) throws Exception {
String key = "";
String cx = "";
String keyword = "apfel";
URL url = new URL("https://www.googleapis.com/customsearch/v1?key=" + key + "&cx=" + cx + "&q=" + keyword);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.addRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)");
BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
if(output.contains("\"src\": \"")){
System.out.println(output); //Will print the google search links
}
}
conn.disconnect();
}

Google custom image search - only returns website images

I want to fetch some google images with the Google custom search API. But instead of the google images Iam getting the thumbnails of the websites. Here an example:
Iam getting the link of these thumbnail images:
But I want to have the links of these images:
Maybe somoene can tell me how to do that!
The Code:
public static void main(String[] args) throws Exception {
String key = "";
String cx = "";
String keyword = "coke";
URL url = new URL("https://www.googleapis.com/customsearch/v1?key=" + key + "&cx=" + cx + "&q=" + keyword);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.addRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)");
BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
if((output.contains("jpg") || output.contains("png")) && output.contains("src")){
System.out.println(output); //Will print the google search links
}
}
conn.disconnect();
}
Thanks a lot!

You aren't specifying that you want image search from Google. You are just searching for possible images in normal results. You'll need to add searchType=image.
Check this question and learn more about querying here.

HTTP URL connection response

I am trying to hit the URL and get the response from my Java code.
I am using URLConnection to get this response. And writing this response in html file.
When opening this html in browser after executing the java class, I am getting only google home page and not with the results.
Whats wrong with my code, my code here,
FileWriter fWriter = null;
BufferedWriter writer = null;
URL url = new URL("https://www.google.co.in/?gfe_rd=cr&ei=aS-BVpPGDOiK8Qea4aKIAw&gws_rd=ssl#q=google+post+request+from+java");
byte[] encodedBytes = Base64.encodeBase64("root:pass".getBytes());
String encoding = new String(encodedBytes);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setRequestProperty("User-Agent", "Mozilla/5.0");
connection.setRequestProperty("Accept-Charset", "UTF-8");
connection.setDoInput(true);
connection.setRequestProperty("Authorization", "Basic " + encoding);
connection.connect();
InputStream content = (InputStream) connection.getInputStream();
BufferedReader in = new BufferedReader(new InputStreamReader(content));
String line;
try {
fWriter = new FileWriter(new File("f:\\fileName.html"));
writer = new BufferedWriter(fWriter);
while ((line = in.readLine()) != null) {
String s = line.toString();
writer.write(s);
}
writer.close();
} catch (Exception e) {
e.printStackTrace();
}
}
Same code works couple of days back, but not now.

The reason is that this url does not return search results it self. You have to understand google's working process to understand it. Open this url in your browser and view its source. You will only see lots of javascript there.
Actually, in a short summary, google uses Ajax requests to process search queries.
To perform required task you either have to use a headless browser (the hard way) which can execute javascript/ajax OR better use google search api as directed by anand.

This method of searching is not advised is supposed to fail, you must use google search APIs for this kind of work.
Note: Google uses some redirection and uses token, so even if you will find a clever way to handle it, it is ought to fail in long run.
Edit:
This is a sample of how using Google search APIs you can get your work done in reliable way; please do refer to the source for more information.
public static void main(String[] args) throws Exception {
String google = "http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=";
String search = "stackoverflow";
String charset = "UTF-8";
URL url = new URL(google + URLEncoder.encode(search, charset));
Reader reader = new InputStreamReader(url.openStream(), charset);
GoogleResults results = new Gson().fromJson(reader, GoogleResults.class);
// Show title and URL of 1st result.
System.out.println(results.getResponseData().getResults().get(0).getTitle());
System.out.println(results.getResponseData().getResults().get(0).getUrl());
}

Google search using custom search

I'm requested to write an inverted index, so I would like as a start to write a java program which google searches a word and putting the results into an arraylist.
Here's my code:
String search = "Dan";
String google = "http://www.google.com/cse/publicurl?cx=012216303403008813404:kcqyeryhhm8&q=" + search;
URL url = new URL(google);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/json");
BufferedReader reader = new BufferedReader(new InputStreamReader(
(conn.getInputStream())));
// Gather the results to a String array
List<String> resultsList = new ArrayList<String>();
String r;
while ((r = reader.readLine()) != null)
resultsList.add(r);
conn.disconnect();
System.out.println("Google Search for: " + search + " Is Done!");
The programs runs with no crashes in the middle, but I get only a source code of a page (which does not contain any links).
What do I need to change in the code? Maybe I need a whole different method?

If you want to use google search in your app you should use Google's API for that:
Custom search API
You get search results in JSON format.