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How To Get Web Server
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The following lines need to be written into a bash script and copied to /etc/profile.d to run on RPI startup.
The script executed by bash one; Another example can be run with a Lua script (in www/cgi). Server Fault is a question and answer site for system and network administrators. Signing up only takes a minute.
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One of the computers (the big one in the picture) is more powerful than the others and runs Ubuntu, with three Live Node.js servers running different applications on different ports. Some computers have Windows.
So far I’ve tried Bind9 on the server machine and manually setting static IPs and hard DNS on three client machines but it doesn’t work and when I do I’ll post this question if anyone has a better way.
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The quickest way to install the dnsmasq package is based on Linux distributions (Arch/CentOS/RHEL/Ubuntu). Store all entries in /etc/hosts on your DNS server (which uses dnsmasq). Keep your entire working/Linux environment here.
In most cases this can be done by an internal DNS server. If you don’t have one, you can simply add entries to the temporary file on each of the three client computers.
The purpose of this post is to explain how to send the body of a request to an HTTP web server running on an ESP8266. In this example, we’re going to send an HTTP POST request to the server with some JSON data.
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You can see the previous tutorial where we explain how to configure the ESP8266 to work as a simple HTTP server. It is helpful to understand some of the terms used here.
First we include the ESP8266WiFi library which provides the necessary functionality for the ESP8266 to connect to a WiFi network. On the previous page you can read in detail how to connect to a WiFi network from the ESP8266.
Next, we include the ESP8266WebServer library, which exposes the ESP8266WebServer class for use in this post.
Next, we declare a change to the global object of the previously specified class. The constructor of this class takes as an argument the port on which the server will listen. We will pass 80 which is the default HTTP port.
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During the installation process, we first open the serial port and connect to the WiFi network. One important thing is to publish the ESP8266’s local IP on our WiFi network so we know where to send the HTTP request to. To get this value we simply call the global route in the global wifi and publish it in the private port.
Next we need to define what code should be executed when an HTTP request is made to our website. To do this, we call a method on the previously declared global server object.
As the first argument of this method, we pass the path or path that the server will listen on. As the second argument, we specify the handler function that will be executed when a request arrives on the route. Of course we can define many methods and functions, but for our simple example we will only use the method named “/body”.
So, the code mentioned below shows that when an HTTP request is received on the path “/body”, the handleBody is triggered to run. Note that we are not talking about the IP or port that the ESP8266 is listening on, but the URL path from there.
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To handle actual HTTP requests, we need to call the HandleClient method on the server object in the body of the loop.
Finally, we need to define our handle function called handleBody. But first we have to keep in mind that there is no specific method or function to find a group of requests. Therefore, in the current implementation, the body of the request is set to an argument called “plain”.
So the first thing we can do is check if the “simple” argument is present in the request you received. If not, we will resend a message saying the body was not received.
To check if there is another argument, we need to call the hasArg method on the server object that will receive the argument’s name. Returns a boolean indicating whether it exists or not.
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To send a response to a request, we simply call the send method, which receives the content type and content as the HTTP response code.
When a body (as a “logical” argument) has been received, we get it simply by calling the arg method on the server object and passing in the name of the argument.
Finally, we send the text in the response message to the client. In addition, we also print this message to the sample port for illustration purposes. Note that serial port printing can affect performance if your web server receives many requests in a short period of time.
To test the code, first upload it to the ESP8266 using the Arduino IDE. Next, open the serial port, wait for the connection to the WiFi network and take the published local IP.
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So to physically send a post request to the ESP8266, the quickest way is to use a tool like Postman. Postman is an HTTP client for testing HTTP requests , which is very useful for testing REST APIs. You can see a simple video on how to make GET requests with Postman and how to make POST requests here.
So, after opening Postman, select the POST option from the drop-down menu and enter the link where the request will be sent:
Note that you need to replace 192.168.1.73 (the IP of my ESP on my network) with the local IP printed on your Arduino computer.
Next, go to the Postman panel, select the “raw” radio button, and in the last drop-down line, select JSON (application/json). Finally, enter your desired information in the input field below. In this example I sent some JSON representing a command to the device:
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Then click Submit and if everything is set correctly you should get the output as shown in Figure 1 which also includes the main areas to edit the ones mentioned before.
On the ESP8266 side you can look at the serial console where the body of the received request should be printed as shown in Figure 2.
As an additional test, you can remove the text content from Postman and resend the request. Since no body was sent in this case, a “Body not Received” message should be sent back from the server.
We’ll start by understanding how web servers work and the importance of gateway servers. Next, we’ll go through a list of Python servers along with their basic features. Many of them exist
How The Web Works, Http Request/response Cycle
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