C: how to read a webpage

I'm trying to open a connec开发者_开发百科tion to a webpage (e.g. www.google.com) via localhost, port 80.

How can I do this programatically in C? I want get all the HTML headers and not just the content ;(

I hope someone can help.

Many thanks in advance,

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Here is some example code on how to do this with libcurl:

http://curl.haxx.se/libcurl/c/getinmemory.html

There is another one right there, that shows you how to get some header data:

http://curl.haxx.se/libcurl/c/getinfo.html

These examples and many others are available as part of the libcurl distribution. It should more than get you started.

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Summarized process:

• DNS resolution for the hostname (using getaddrinfo())
• Open a stream socket (TCP) to the resolved IP address and port

• Send GET request (see protocol in: http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol)

  GET /index.html HTTP/1.1 Host: www.example.com

• Read headers - Terminated by \r\n\r\n

• Read body
• Close socket

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Minimal runnable POSIX example

In this answer, I provide a minimal runnable POSIX C example: How to make an HTTP get request in C without libcurl?

It allows you to do:

./wget example.com

to download http://example.com