How to make the client perform a http post with php? - php

I'm building some efficiency tools for a crappy website. This website uses http-posts for some of it's navigation. What I need is that when a user runs a script on an url (redirect.php), I want the client to post to an url on an external site, with some variables.
I know I could do this with javascript, creating a form and posting to it, but I would prefer doing it with php if possible. It needs to be the client that get's forwarded, because they are authenticated with the website that I'm sending them to.

The only way to make a browser send a POST request anywhere is by making a form and submitting it, or doing equivalent trickery using Javascript. You cannot make a browser issue a POST request in response to a redirect response. There are specifications for response codes which allow "POST redirects", but no current browser implements them.

Related

How to receive post request on web page?

I want to receive the post request on a web page while my page isn't refreshing or is still or just open, sort of concept like dynamic messages without refreshing the page. I don't want to pull it using ajax
I tried sending request to that URL but that doesn't work. I wanted to know a way to receive a post data and display it to user.
Any help is appreciated.
I read about amazon sns push for http/s, but they too doesn't send request to each browser page. they just send the request to the server, how should i make things in a way that , that post request from amazon goes to every browser page wherever it is open and display the content in the post message.
Maybe you are looking for WebSocket? It is basically a protocol used to send information from server to client without the need for the client to make a request. Similar to what chats systems like facebook messenger use, it stops the client having to poll a server for data.

Is ajax post using jquery secured?

I would like to ask this because if no quite sure that it secure.
I am planning on changing my page to ajax based registration. So my data will be inserted using jquery ajax post.
But if someone uses firebug and see where my post is being sent, they can use other form of firefox addons to post data on that url and can easily register without going to my page.
Although I can validate the request first where it is comming from though but that would be extra codes and work.
I will also add server validations for my form since someone can register without validation using the direct url that they will see on firebug.
I just wanted to know if there is already a standard procedures in applying ajax based data post.
But with ajax based select / fetch is cool and very useful.
Currently this is what I am planning on doing on my registration page.
validate that all request's must come from my registration page.
might use a transaction / request code
might use cookie
might use session
might use date time comparisson
if validation fails I should have a form validation on server side
to clean my the posted data before inserting to db
Never trust a UI.
Whether you do an Ajax post or a standard post, people can figure out what you are posting and create their own client. Even if you use https, the person controlling the browser can see what is posted and decipher the protocol.
You need to create your service so that it is not vulnerable to a user handcrafting a client.
If a user can use their browser to register on your site via Ajax, they can spoof the registration using some other programming language. There isn't anything you can do to make it so they can only register from your site via Ajax.
You can implement tricks to make it difficult for them to figure out, but you can't make it impossible. They can spoof the referrer, load other pages to get the required cookies/session variables, spoof Ajax request headers etc.

redirect to a page on a different server and post parameters to it

I am supposed to capture data from a form and send the data to a url on a different server.For eg:-I have a form on a page at the url http://www.form.com/register.php.
I capture all the data from this form and for some reason need this data to be processed on a page on another server at http://www.thereceivingpage.com/process.php.
As of now I am using headers to redirect with the parameters in the query string something like this:-Header(Location:http://www.thereceivingpage.com/process.php?name=alice&address=a1&address2=a2) but I need to send a larger amount of data which wont happen as GET request. Can anyone suggest a better way where in I can post data rather than the data in the query string ...thanks
Use cURL. If you have to redirect to the site, it gets a bit trickier but you can still do it. You can get the cookie and redirect information back from the site and then do a GET redirect using header.
Can you not update the action to simply post directly to that form? Otherwise, you might want to look into something like curl: http://ca.php.net/manual/en/function.curl-exec.php
You'll pretty much re-use the header redirect syntax with the parameters but instead you'll tell it to be a post.
redirect to a page on a different server and post parameters to it
thanks to internet standards, that's impossible.
if it's third-party site, let user to interact with it directly. do not interfere between them, it smells
If you want to develop secure applications then you should be aware that http://www.thereceivingpage.com/process.php is vulnerable to Cross-site Request Forgery (CSRF), meaning that anyone, from any site, can post form data to process.php.
process.php should be checking for a token (which www.thereceivingpage.com transmitted to the user as part of the form) and should be rejecting form submissions that don't contain the token to prevent submissions coming from anywhere but www.thereceivingpage.com and thus protecting your users from being manipulated into making requests they didn't want to.
In addition to your concern about the size of the GET requests you cause the client to make when redirecting, it's also not a good practice to turn POST requests into GET requests.
The best solution is to completely rethink the notion of delivering a form from one site to be submitted to a different site.
You can manually set headers and send request or you can use curl
see this
http://www.askapache.com/htaccess/sending-post-form-data-with-php-curl.html

Can i make POST after a POST is submitted?

What I'm trying to do is:
I have a form. I submit that form. In the code of the target script I want to make some validations. In a certain case, I want to make a POST to another URL. I don't want to just make a redirect to an URL.
I don't know if this is possible, that's why I'm asking.
I'm working with PHP.
Thanks!
To the people who suggested cURL: Building a request like so will send the data on behalf of the server not the client. I don't think he wants that.
He wants POST forwarding and that, if it were to exist (and I don't think it does), should be implemented by the browser.
What I suggest is to use an AJAX call to make the validation before posting. And then depending on the response you choose the destination for posting (on the client side).
To summarize: You request a validation from the client. You do that validation on the server. You send back instructions to the client. You post according to the instructions received from the server.
I'm not sure if you understand this, but any details of requests made by the user(client) are known in full by him. You can't make him POST to an URL, have a password in that POST, and not have access to that password.
Note: If it's easier you can read JavaScript and PHP instead of client and server.
It is definitely possible. You could use the PHP cURL library to easily create a POST request. But this might be overkill for what you are trying to achieve. Is it a possibiity to do the validation in JavaScript and change the form action attribute with JavaScript after submitting?
In what case would you need to post it to another PHP file.
Couldn't you simply use IF statements to redirect the script to another script depending on the results of the validation?

Simulate HTTP POST (Form)?

I need to populate my database with test data. But my data needs to be manipulated to be put into the form by my PHP FORM before upload.
How can I automatic the process of filling out my web application form field, which also need to accept uploading images?
Progamatically, you can do this by making a post request in your language of choice.
Tool wise, you can use Fiddler2 which has support for making HTTP Post requests.
You'll have to fill out the HTTP Request body properly; usually form post variables look like this:
name1=value1&name2=value2
Or use curl.
This SuperUser question shows how to make an HTTP post using curl.

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