• Pascal

with TFPHTTPClient.Create(nil) do
begin
 Post(u);
 Free;
end;

• C#

new HttpClient().PostAsync(u, content);

• D

auto response = post(u, content);

• Dart

await post(u, body: body, headers: headers);

• Go

response, err := http.PostForm(u, formValues)

• Go

response, err := http.Post(u, contentType, body)

• JS

fetch(u, {
        method: "POST",
	body: JSON.stringify(data)
})

• Java

String s = HttpClient.newHttpClient().send(HttpRequest.newBuilder()
                        .uri(URI.create(u))
                        .POST(HttpRequest.BodyPublishers.ofString(content))
                        .build(), HttpResponse.BodyHandlers.ofString())
                .body();

• Lisp

(dex:post u)

• Lisp

(drakma:http-request u :method :post)

• PHP

$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, $u); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
curl_setopt($ch, CURLOPT_POST, 1);
$output = curl_exec($ch); 
curl_close($ch);

• Perl

# Create a user agent object

my $ua = LWP::UserAgent->new;
 
# Create a request
my $req = HTTP::Request->new(POST => $u);
 
# Pass request to the user agent and get a response back
my $res = $ua->request($req);
 
# Check the outcome of the response
if ($res->is_success) {
    print $res->content;
}
else {
    print $res->status_line, "\n";
}

• Perl

my $response = `curl -X POST $u`;

• Perl

perl -Mojo -E 'my $u = "www.example.com"; say p($u)->body;'

• Python

data = parse.urlencode(<your data dict>).encode()
req =  request.Request(u, data=data, method="POST")
resp = request.urlopen(req)

• Ruby

Net::HTTP.post(u, content)

• Rust

let client = reqwest::blocking::Client::new();
let mut response = client.post(u).body("abc").send()?;