ScanMe | Chrome extension that you can scan the qr code | QRCode Processing library

The real netcat can read from socket and from stdin in parallel. Your program can read either from stdin or from the socket and both of these calls getline() and recv() are waiting of there are no data.

So your program probably:

1. getline() reads a line from stdin. The line contains something like "GET ... \n"
2. send the line to server but it is not complete http request because it is not ended by empty line so http server does not respond and waits for http headers.
3. Your program calls recv() and blocks forever.

You need to change the logic of your program. You can either use separate threads for reading from stdin and receiving data or you can use select() or poll() which provides waiting for an events on multiple file descriptors.

EDIT: additional clarification due to a question in comment

The HTTP request consists of

• request line
• request headers (0 headers are valid)
• request body (can be empty)

Request headers and request body are diveded by an empty line. The empty line is required even if the body is empty because server needs to know that there are no more headers.

Moreover the HTTP standard requires at the and of line. Minimum valid HTTP request (no headers, empty body) is a request line followed by an empty line: "GET / HTTP/1.1\r\n\r\n"

From the nmap manual we learn:

In previous versions of Nmap, -Pn was -P0. and -PN..

Therefore, -P0 is now -Pn.

Now what is -Pn?

This option skips the Nmap discovery stage altogether. Normally, Nmap uses this stage to determine active machines for heavier scanning. By default, Nmap only performs heavy probing such as port scans, version detection, or OS detection against hosts that are found to be up. Disabling host discovery with -Pn causes Nmap to attempt the requested scanning functions against every target IP address specified. [...]

A type can conform to Codable provided all its properties conform to Codable. All of your properties do conform to Codable except for the enums, and they will conform to Codable if you declare that they do. Thus, this simple sketch of your types compiles: