I am getting a HTTP 405 error indicating that the method is not allowed, and it appears to

In my Javascript program, I requested this URL using the library epson-2.6.0.js, which is the Epson SDK for JavaScript specifically designed for thermal printers. My target device is a TM U220 connected via ethernet.

GET XHR http://192.168.199.15:8008/socket.io/1/

OPTIONS XHR http://192.168.199.15/cgi-bin/epos/service.cgi   [HTTP/1.1 405 Method Not Allowed 7ms]

A Cross-Origin Request was Blocked: The Same Origin Policy prevented access to the remote resource located at . (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).

Response headers (118 B) 

Allow   GET, HEAD, POST
Content-Length  0
Server  Allegro-Software-RomPager/4.01

Request headers (478 B) 

Accept  text/html,application/xhtml+xm…plication/xml;q=0.9,*/*;q=0.8
Accept-Encoding gzip, deflate
Accept-Language en
Access-Control-Request-Headers  content-type,if-modified-since,soapaction
Access-Control-Request-Method   POST
Connection  keep-alive
DNT 1
Host 192.168.199.15
Origin  null
User-Agent  Mozilla/5.0 (Windows NT 10.0; …) Gecko/20100101 Firefox/58.0

I have been extensively researching online for solutions to resolve this issue. Unfortunately, I am unable to modify the printer firmware for the HTTP server and can only make changes from within the JavaScript code that I have control over.

javascriptajaxprintingcors

Answer №1

In order to utilize ePos Webservices, you must make sure it is enabled.

It can't be accomplished through the provided executable tools. Once your printer is linked to the network and has a valid local IP address, you should open (or the IP of your Epson device) in your preferred web browser. You will be prompted for a username and password, which defaults to epson/epson OR epson/printer serial number. Proceed to the ePos print section, enable the ePos Print option, then click on the restart button below. By doing this, the printer will include an Allow-Cross-Origin * header in the HTTP response headers, eliminating the need to disable any essential browser features.

Answer №2

If you find yourself facing the CORS issue without control over the server, there are a couple of solutions that can help.

Option 1:

One option is to install a CORS plugin like this one. This can be handy if your application is intended for personal use only and not meant to be accessed by others. Just be aware that certain websites may not function properly with this tool, so proceed with caution.

Option 2:

Another solution is to set up your own proxy server, although this requires some technical expertise. By creating a proxy server, you can address the CORS issue, especially if your application serves multiple users. I have personally used this method before with success. You can host your proxy server on platforms like Heroku or any other hosting service. The proxy server would handle the OPTIONS request and include the necessary Access-Control-Allow-Origin: * in the response headers, allowing your browser to make the required get/post calls. It will then forward your request to the actual server and return the response to the client.

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