Using Ionic framework 1,
Making request using $http.post(); but, in the console.. two requests are getting generated.
the first request doesn't contain the POST parameters and is blank , while the second request contains the POST parameters as passed to $http.post() method.
What could be the possible reason ?
May be it's checking if already cached resource is updated or not by making a blank request to the server, before making a request to load data.
But, I have not enabled any caching or anything. Everything is default.
The first request is the Request Method: OPTIONS request. It checks whether or not the actual request is safe to send. It is also called 'preflighted request'
Related
I need help with axios, I don't know why is sending two request here an image of chrome network in one post call
I'm using react, and when I send request the function only trigger once (I debugged and put console.logs and get one response) but in chrome network I got two request, with different headers and type.
One have Authorization token, and the other don't have tokensuccess request and
wrong request this is in one call and I don't know what is happening.
Thanks for your time!
Is it an OPTION request?. OPTION requests are used to check if your client has permission to make the desired request to the API.
The HTTP OPTIONS method requests permitted communication options for a given URL or server. A client can specify a URL with this method, or an asterisk (*) to refer to the entire server.
I have to use Postman to send POST PUT and DELETE request to my server, is there any way I can hit POST request through browsers directly, using browser front end only
I Have a form that on submits should delete data from my server but using a form I can send only the GET or POST method only I know I can do it with the POST method, but I need to do it by DELETE.
You may be able to send a "DELETE" request via Ajax, the question should be will your server understand it.
While DELETE is a http method, it's not a generally supported request type in most back-end frameworks, rather you generally "overload" a POST request while setting the action as delete via a hidden form field.
So depending on your back-end framework, you would need to consult their documentation, but generally its accomplished as described above.
As for performing a POST request by URL alone, in a browser there is no way that I'm aware of, you need some tool, to be able to set headers to be able to form a POST request, such as JavaScript, curl etc
MDN has a great introduction to the topic
The HTTP POST method sends data to the server. The type of the body of the request is indicated by the Content-Type header.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST
I am using ionic framework and angular js, I use chrome for viewing my logs but here I am doing a login page I am trying to post the user entered data to serve but I am getting this error like -
XMLHttpRequest cannot load - Response for preflight has invalid HTTP status code 405.
My code works fine on a device but I am getting the error in chrome. Anyone know the root cause of this error.
Cross-Origin Resource Sharing actually specifies that two requests should be made to the server on an AJAX call (if certain conditions apply, like sending custom headers).
The first request (the one with the OPTIONS method) is called pre-flight and is used to check if it's safe to send the full request to the server. The response from the server should contain a valid Access-Control-Allow-Origin header containing the URL of the client or *.
HTTP 405 means Method Not Allowed. You may be sending the request with a different method on chrome. If you try the URL directly in browser it triggers a GET request on that URL.
I'm implementing my own http module.
As I'm reading the official node.js http module api, I couldn't understand a few things:
If the user is using the response.writeHead(statusCode, [reasonPhrase], [headers]) function, are the headers should be written immidiatly to the socket or are they first supposed to be saved as a member to the object? and then written only after .end() function?
What is the meaning of implicit headers that should be used whenever the user didn't use writeHead()? are they supposed to be set ahead? and if the user didn't set them? what should be the behavior? thanks
Answers:
Anything that you write into response either headers with writeHead or body with write is buffered and sent. You see they use socket buffers. They can only hold fixed amount of data, before being sent. The important fact to remember is that you can only set headers before you start writing the body. If you do, some headers will set for you by the http server itself.
Implicit headers are ones which you don't write specifically but are still sent. Setup a simple http server, by responding a request without setting any header. Then view the request headers opening the site in browser. There will be headers like Date, Server, Host etc which are added to every request automatically without user's volition.
I found answer for the first question, but still don't understand the second one.
The first time response.write() is called, it will send the buffered header information and the first body to the client. The second time response.write() is called, Node assumes you're going to be streaming data, and sends that separately. That is, the response is buffered up to the first chunk of body.
I am trying to redirect to another URL from node js by using response.writeHead method
response.writeHead(301, {Location : <redirecturl>})
I need to have this redirection is being executed by POST method, however it is always executed by GET. What is the way that the redirection can be made as a POST request.
A redirect by default sends a GET request. According to the HTTP spec, a 301 redirection means sending a GET request. If you want to redirect with the same method (POST), you can try doing a 307 redirect instead.
There is no difference between redirection in both GET and POST methods. Both method should work find. Better you can your expressjs framework in which it is
res.redirect('http://example.com');
Be careful, when using status code 301 which means Moved Permanently. Once browser gets 301 status code, it will directly try the redirected URL from the next time.
Without seeing more of your code, I believe this is what you are describing:
The client has made a request to your application using an HTTP method (get, post, etc.) You are responding to that request by sending back a 301 error and a new URL (redirecturl)
The client then decides to implement a get request for the redirecturl.
You can't change how a client responds to a 301. That is out of your control and it is normal for browsers to initiate a get for the redirecturl.
You could initiate a post request from your server to the redirecturl.
You could send back a webpage which would then submit a post request from the client.
What are you trying to achieve?