C语言 如何在 C 中解析 HTTP 响应？
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How to parse HTTP responses in C?
提问by Güter M.
I'm writing a little project which interacts with a set of servers using HTTP 1.1 GET and POST. The server gives me the response after some header lines, so I though on using strtok()function using \nas the delimiter but there is a crash whenever I try to do so.
我正在编写一个小项目，它使用 HTTP 1.1 GET 和 POST 与一组服务器进行交互。服务器在一些标题行之后给了我响应，所以我虽然使用strtok()函数\n作为分隔符，但是每当我尝试这样做时都会发生崩溃。
Is there any simple way to parse a HTTP response in C? I would like not to use 3rd party libraries for this but if it was really necesary I won't have any problem.
有什么简单的方法可以在 C 中解析 HTTP 响应？我不想为此使用 3rd 方库，但如果真的有必要，我不会有任何问题。
Thank you very much for everything.
非常感谢你所做的一切。
EDIT: Here is some example code, just trying to print the lines:
编辑：这是一些示例代码，只是尝试打印行：
char *response = "HTTP/1.1 200 OK\nServer: Apache-Coyote/1.1\nPragma: no-cache"
char *token = NULL;
token = strtok(response, "\n");
while (token) {
printf("Current token: %s.\n", token);
token = strtok(NULL, "\n");
}
回答by Eli Bendersky
http-parseris a simple and super-fast HTTP parser written in C for the Node.js project
http-parser是一个用 C 语言为 Node.js 项目编写的简单且超快的 HTTP 解析器
It's only 2 C files, without any external dependencies.
它只有 2 个 C 文件，没有任何外部依赖。
回答by Jerry Coffin
The problem in the code you've posted is pretty simple: strtokworks by modifying the string you pass to it. Modifying a string literal gives undefined behavior. A truly minuscule change to your code lets it work (I've also headed the appropriate headers, and moved the executable part into a function:
您发布的代码中的问题非常简单：strtok通过修改传递给它的字符串来工作。修改字符串文字会产生未定义的行为。对您的代码进行真正微小的更改即可使其工作（我还引导了适当的标头，并将可执行部分移到了一个函数中：
#include <string.h>
#include <stdio.h>
char response[] = "HTTP/1.1 200 OK\nServer: Apache-Coyote/1.1\nPragma: no-cache";
int main() {
char *token = NULL;
token = strtok(response, "\n");
while (token) {
printf("Current token: %s.\n", token);
token = strtok(NULL, "\n");
}
return 0;
}
In real use, you'll be reading the HTTP response into a buffer anyway; the problem you encountered only arises in a trivial test case like you generated. At the same time, it does point to the fact that strtokis a pretty poorly designed function, and you'd almost certainly be better off with something else.
在实际使用中，您无论如何都会将 HTTP 响应读入缓冲区；您遇到的问题只出现在像您生成的琐碎测试用例中。同时，它确实指出了strtok一个设计非常糟糕的功能的事实，而且几乎可以肯定你会更好地使用其他东西。
