http - w3toppers.com

how can an application use port 80/HTTP without conflicting with browsers?

There are 2 ports: a source port (browser) and a destination port (server). The browser asks the OS for an available source port (let’s say it receives 33123) then makes a socket connection to the destination port (usually 80/HTTP, 443/HTTPS). When the web server receives the answer, it sends a response that has 80 as … Read more

http download file name

You need to append the HTTP response header “Content-Disposition” Response.AppendHeader(“content-disposition”, “attachment; filename=\”” + fileName +”\””);

HTTP 400 (bad request) for logical error, not malformed request syntax

Status 422 (RFC 4918, Section 11.2) comes to mind: The 422 (Unprocessable Entity) status code means the server understands the content type of the request entity (hence a 415(Unsupported Media Type) status code is inappropriate), and the syntax of the request entity is correct (thus a 400 (Bad Request) status code is inappropriate) but was … Read more

Service Oriented Architecture – AMQP or HTTP

At first, REST, RPC – architecture patterns, AMQP – wire-level and HTTP – application protocol which run on top of TCP/IP AMQP is a specific protocol when HTTP – general-purpose protocol, thus, HTTP has damn high overhead comparing to AMQP AMQP nature is asynchronous where HTTP nature is synchronous both REST and RPC use data … Read more

Console errors. Failed to load resource: net::ERR_INSECURE_RESPONSE

I am assuming you’re using Chrome. If so, the root problem is a certificate mismatch / expired certificate. You can see this for yourself in the code here. Note in particular the use of the very constant you reference in the code on line 48 of the C++ file I sent you: case net::ERR_INSECURE_RESPONSE: The … Read more

Is an HTTP PUT request required to include a body?

HTTP requests have a body if they have a Content-Length or Transfer-Encoding header (RFC 2616 4.3). If the request has neither, it has no body, and your server should treat it as such. That said it is unusual for a PUT request to have no body, and so if I were designing a client that … Read more

What is the usefulness of PUT and DELETE HTTP request methods?

DELETE is for deleting the request resource: The DELETE method requests that the origin server delete the resource identified by the Request-URI. This method MAY be overridden by human intervention (or other means) on the origin server. The client cannot be guaranteed that the operation has been carried out, even if the status code returned … Read more

Make a URL-encoded POST request using `http.NewRequest(…)`

URL-encoded payload must be provided on the body parameter of the http.NewRequest(method, urlStr string, body io.Reader) method, as a type that implements io.Reader interface. Based on the sample code: package main import ( “fmt” “net/http” “net/url” “strconv” “strings” ) func main() { apiUrl := “https://api.com” resource := “/user/” data := url.Values{} data.Set(“name”, “foo”) data.Set(“surname”, “bar”) … Read more

How to define the basic HTTP authentication using cURL correctly?

curl -u username:password http:// curl -u username http:// From the documentation page: -u, –user <user:password> Specify the user name and password to use for server authentication. Overrides -n, –netrc and –netrc-optional. If you simply specify the user name, curl will prompt for a password. The user name and passwords are split up on the first … Read more

Why this simple web server is called even number times?

It is because every incoming request is routed to your HelloWorld() handler function, and the browser makes multiple calls under the hood, specifically to /favicon.ico. And since your web server does not send back a valid favicon, it will request it again when you refresh the page in the browser. Try it with Chrome: open … Read more