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Building a Web server in Bash, part III - Login

Leandro Proença on August 01, 2022

In the previous posts we've seen how to manipulate sockets using netcat. Moreover, we learned how to start reading and parsing an HTTP message usin...
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David •

Thanks for the great article. One thing I didn't understand is: Where does home.html parse {{name}} from?

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Leandro Proença •

Using sed:

  RESPONSE=$(cat home.html | \
    sed "s/{{$COOKIE_NAME}}/$COOKIE_VALUE/")
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Did I answer your question?

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David • • Edited

Thanks for the reply. Not quite. shouldn't there be a name= somewhere?

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Mac •

Informative post!

I will let you know, you define the function as handleRequest however in one call of it you misname it: cat response | nc -lN 3000 | processRequest

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Tomas •

Seems Part III is broken. Page shows "Liquid syntax error: Unknown tag 'endraw' "

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Leandro Proença •

thanks, it might be a platform issue, I edited then just saved the post. seems working now

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Michael Hotwagner •

Just want to give big thanks for this awesome post. Seriously great stuff!

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Vinícius Gajo •

The cat trick does not work for me. When I try to understand what is happening in Chrome DevTools it shows me this:

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Apparently the server is not able to parse correctly the HTML file. Did you have this problem before?

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Leandro Proença •

never seen this before. maybe OS issue? netcat implementation issue?

anyway, try using \n instead of \r\n

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Vinícius Gajo •

Maybe the problem is the OS or the IDE I'm using (Emacs). I tried setting explicitly the \r\n but it did not work either. But, it worked after I set the headers in the string, and just cat the HTML content, like this:

RESPONSE="HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n$(cat html/home.html)"
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Leandro Proença •

good catch! yes, unfortunately when dealing with stuff low-level we may face OS/tools implementations issues

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Aaron Gray •

Hi, can you wrap it all up in a github repo please if you have not done so already ?