从 mod_esi 或 webtools 中的 Env 检索值
一个完整的菜鸟问题，但我到底如何获取值（例如 path_info) 从回调内部？从文档中，我认为这是 元组列表，我认为可以通过以下方式访问它 列表：keyfind，但我没有运气。到目前为止，我所举的所有例子 发现仅显示如何使用 io_lib 打印所有内容，但不显示如何 通过键访问值...
谢谢， --tim
文档：
模块：函数（SessionID，Env，输入）-> _
Types
SessionID = term()
Env = [EnvironmentDirectives] ++ ParsedHeader
EnvironmentDirectives = {Key, Value}
Key = query_string | content_length | server_software | gateway_interface | server_protocol | server_port | request_method | remote_addr | script_name. <v>Input = string()
A complete noob question, but how exactly do I get values (e.g.
path_info) from inside the callback? From the docs, I thought it was
a list of tuples, which I thought would make it accessible via
lists:keyfind, but I've had no luck. So far, all the examples I've
found only show how to print everything with io_lib but not how to
access the values by key...
Thanks,
--tim
The docs:
Module:Function(SessionID, Env, Input)-> _
Types
SessionID = term()
Env = [EnvironmentDirectives] ++ ParsedHeader
EnvironmentDirectives = {Key, Value}
Key = query_string | content_length | server_software | gateway_interface | server_protocol | server_port | request_method | remote_addr | script_name. <v>Input = string()
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所以，这就像我担心的那样令人尴尬......在弄清楚 debug_info 编译器标志前面有一个 + 而不是 - 之后，我发现它实际上是一个元组列表。我的问题与我尝试将其打印出标准输出有关 - 不喜欢该元组并且挂起。无论如何，
列出：keyfind(path_info,1,Env)。
-> {path_info,"/some/path"}
现在，继续这个学习 erlang 的谦卑之旅......
So, it is as embarrassing as I feared... after figuring out there's a + in front of the debug_info compiler flag instead of a -, I was able to figure out that it is in fact a list of tuples. My problem had to do with my attempting to print it out stdout - didn't like the tuple and was hanging. Anyway,
lists:keyfind(path_info,1,Env).
-> {path_info,"/some/path"}
Now, to continue this humbling journey that is learning erlang...