Java Community | Help. Code. Learn.•7mo ago

how to use RFC1123 date in http header?

hey guys. can smb explain to me how to use DateTimeFormatter RFC_1123_DATE_TIME? Im making a request to the api and i need to have Date header with its value being in RFC1123 format. can smb help me out? i dont understand what to write here:

HttpHeaders headers = new HttpHeaders();
headers.set();

HttpHeaders headers = new HttpHeaders();
headers.set();

thanks in advance.

36 Replies

JavaBot•7mo ago

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Kyo-chan•7mo ago

I mean, it depends on what client API you're using. In the most general case, there's nothing special, that's like if you wanted to set a numeric header you'd first convert your value to String then set the header to that String. It's the same principle with a date.

Tomasm21•7mo ago

Use ZonedDateTime to get the current date and time. ZonedDateTime is preferred as it includes the time zone information which is important for the RFC-1123 format.

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import org.springframework.http.HttpHeaders;

public class Example {
    public static void main(String[] args) {
        // Step 1: Get the current date and time
        ZonedDateTime now = ZonedDateTime.now();
        
        // Step 2: Format the date and time using RFC_1123_DATE_TIME
        String formattedDate = now.format(DateTimeFormatter.RFC_1123_DATE_TIME);
        
        // Step 3: Create HttpHeaders and set the Date header
        HttpHeaders headers = new HttpHeaders();
        headers.set("Date", formattedDate);
        
        // Example output
        System.out.println("Formatted Date: " + formattedDate);
        System.out.println("Headers: " + headers);
    }
}

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import org.springframework.http.HttpHeaders;

public class Example {
    public static void main(String[] args) {
        // Step 1: Get the current date and time
        ZonedDateTime now = ZonedDateTime.now();
        
        // Step 2: Format the date and time using RFC_1123_DATE_TIME
        String formattedDate = now.format(DateTimeFormatter.RFC_1123_DATE_TIME);
        
        // Step 3: Create HttpHeaders and set the Date header
        HttpHeaders headers = new HttpHeaders();
        headers.set("Date", formattedDate);
        
        // Example output
        System.out.println("Formatted Date: " + formattedDate);
        System.out.println("Headers: " + headers);
    }
}

Kyo-chan•7mo ago

If they use spring's HttpHeaders, then they can simply do headers.setDate(now); It knows to take in a ZonedDateTime and it will format it with RFC_1123_DATE_TIME

bambyzasOP•7mo ago

oh wow. i can do it in such simple way? but will it add GMT letters at the end? bc in postman i set my date to Mon, 27 May 2024 12:55:00 GMT, so i need the same for my app

Kyo-chan•7mo ago

Well, it depends on whether you'll use spring's internal API for http client. If you want it to use GMT, you should force the ZonedDateTime to be on GMT. Let me check an example

bambyzasOP•7mo ago

i use this stuff:

ResponseEntity<String> response = restTemplate.exchange(checkUrl, HttpMethod.GET, entity, String.class);

ResponseEntity<String> response = restTemplate.exchange(checkUrl, HttpMethod.GET, entity, String.class);

yep, its Spring functionality

Tomasm21•7mo ago

yes, but you will not have the added hours:

Tomasm21•7mo ago

and with formatted you will have:

Tomasm21•7mo ago

bambyzasOP•7mo ago

ah, i need the first version but i see that you arent using formattedDate var anywhere for headers. only for sout so i can ditch it, right?

bambyzasOP•7mo ago

and i can just use this

Tomasm21•7mo ago

yes But it will show London time zone where GMT starts

bambyzasOP•7mo ago

what do u mean?

Tomasm21•7mo ago

If you are in some another time zone you ill not see added hours

bambyzasOP•7mo ago

im gmt +3 crap

Tomasm21•7mo ago

me too

bambyzasOP•7mo ago

so whats the solution then? ah wait ok. i see

Tomasm21•7mo ago

You just need GMT at the end? but with added hours? You can edit the formatted string and just add it manually

bambyzasOP•7mo ago

nope. as i understand i dont need added hours, but i need GMT letters appended. for example now its 10:54 on my computer. but if i want to make a request with postman, i need to have this:

Tomasm21•7mo ago

I edited like this:

bambyzasOP•7mo ago

but u have +0300 before GMT letters. i dont need that

Tomasm21•7mo ago

I see

bambyzasOP•7mo ago

i just need to have current GMT time and add GMT letters to the time and thats where im stuck

Tomasm21•7mo ago

Still you can edit the string yourself and find the +0300 and cut it and create new string simple school level string operations but hours will be added at your time zone

bambyzasOP•7mo ago

but wait. i see that this is what i need

bambyzasOP•7mo ago

and i dont need any string operations

Tomasm21•7mo ago

Yes. But I tell you again... - it will give you London time

bambyzasOP•7mo ago

but thats what i need. i just told you

Tomasm21•7mo ago

There:

bambyzasOP•7mo ago

ffs nvm

Tomasm21•7mo ago

I achieved with added hours to my Lithuanian time.

bambyzasOP•7mo ago

i sorted it out man reik GMT laiko, nereik man prisidet triju valandu 😄

Tomasm21•7mo ago

Ok. Just I wanted myself exactly my time. I insisted on this. Supratau Aš pasidariau kaip aš noriu.

bambyzasOP•7mo ago

viskas ok. aciu uz pagalba 💪

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how to use RFC1123 date in http header?