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The strtok() call here:

char* absolute_path = strtok(req_tar, "?");

will crop req_tar at the ? and make it always be equal to abs_path.

Because of this, the following condition will never be true and you'll never extract query:

if(strcmp(req_tar, abs_path) != 0)
    query = strstr(req_tar, abs_path);

But even if that condition triggered, I don't think you understand what query should be.

Given a line "GET /hello.php?name=Alice HTTP/1.1\r\n", this is what you should extract:

• abs_path should be /hello.php
• query should be name=Alice

And this query = strstr(req_tar, abs_path); wouldn't make query become this name=Alice.