HTTP

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Task HTTP

You can use curl or wget commands

Branch: http
Fenrir ID: http
Points: 30

Your solution must be located at http:

 ...
├─  http
│  ├─  part-1.sh
│  ├─  part-2.sh
│  ├─  part-3.sh
│  └─  part-4.sh
└─  .git

Return codes (5 points)

Create a script part-1.sh which runs an http request and parses the return code.

The script must print the answer in the format <DESC>(<CODE>)

Where DESC is a textual description of the return code:

SUCCESS
REDIRECT
CLIENT_ERROR
SERVER_ERROR

And CODE is the return code

To prevent waiting indefinitely for the response, set the maximum execution time to 5 sec.

Synopsis

./part-1.sh <URL>

Output

SUCCESS(200)

Error handling

Code	Description
77	Unable to connect
88	Timeout

Code

Description

Unable to connect

Timeout

Questions

What are the 4 types of http codes?
Why is a timeout necessary?

POST requests (10 points)

You are to create a script part-2.sh which sends a POST request to the server and parses its response.

Request body is defined by the following class:

data class pair(
    val x : Int,
    val y : Int,
)

You must support three content types:

JSON
YAML
XML

XML body must be wrapped in <req version="1.1">…</req>.

Response body is defined by this class:

data class response(
    val result : Int,
)

The script must print only one number: the value of result.

Synopsis

./part-2.sh {-x | -y | -j} <URL> <x> <y>

Options:
   -x        XML format
   -y        YAML format
   -j        JSON format

Output

Error handling

Is not needed. We guarantee the correctness of the input data.

Questions

How does the server understand which format is used?
Which method is used by default in curl?
What is the difference between GET & POST?

Redirections (10 points)

You are to create a script part-3.sh which sends a request to the server and collects all redirections.

The script must print all URLs that are encountered when resolving the server location.

Synopsis

./part-3.sh

Output

http://google.de/ http://www.google.de/ http://www.google.com/

Error handling

Is not needed. We guarantee the correctness of the input data.

Questions

How can the detailed information about an HTTP request be obtained?

Download files (5 points)

You are to create a script part-4.sh which downloads a file from a URL. The file must be saved to the provided directory.

Synopsis

./part-4.sh

The name is defined in the response:

< HTTP/1.1 200 OK < Accept-Ranges: bytes < Content-Disposition: attachment; filename="file.txt"

Error handling

Is not needed. We guarantee the correctness of the input data.

Questions

How can the filename be obtained?
What happens if you try accessing the URL without explicitly downloading the file?

Copyright

The project is licensed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.