Support more headers

[steveklabnik]

Right now, we only support 16 headers:

https://github.com/steveklabnik/simple-server/blob/24b34a7e7de2255ce941bf75798749e5f4d6d58b/src/lib.rs#L105

A real server should support more.

[cmckni3]

I believe this is the cause of my crash since my browser extensions send extra headers. Private browsing works fine.

Stacktrace below

thread '<unnamed>' panicked at 'Tried to unwrap Status::Partial', /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/httparse-1.2.3/src/lib.rs:254:31
stack backtrace:
   0:     0x55d0c5f39203 - std::sys::imp::backtrace::tracing::imp::unwind_backtrace::hfc7985b08e763a82
                               at /checkout/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1:     0x55d0c5f354c4 - std::sys_common::backtrace::_print::h16a1db02a59ead63
                               at /checkout/src/libstd/sys_common/backtrace.rs:71
   2:     0x55d0c5f3b813 - std::panicking::default_hook::{{closure}}::h48ecee46f2eefc30
                               at /checkout/src/libstd/sys_common/backtrace.rs:60
                               at /checkout/src/libstd/panicking.rs:381
   3:     0x55d0c5f3b582 - std::panicking::default_hook::hb4c92ae8d005ca44
                               at /checkout/src/libstd/panicking.rs:397
   4:     0x55d0c5f3bcd7 - std::panicking::rust_panic_with_hook::h25d461655d60b1a5
                               at /checkout/src/libstd/panicking.rs:611
   5:     0x55d0c5d438b6 - std::panicking::begin_panic::h9bdcd5c66c5d5dbb
                               at /checkout/src/libstd/panicking.rs:572
   6:     0x55d0c5d3f93b - <httparse::Status<T>>::unwrap::h46ea993084b0876c
                               at /home/rust/hello_world/<panic macros>:3
   7:     0x55d0c5d69d65 - simple_server::parse_request::h7b3e32d026288916
                               at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/simple-server-0.1.0/src/lib.rs:206
   8:     0x55d0c5d6814c - simple_server::Server::handle_connection::h7df1a41e2dc5ab28
                               at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/simple-server-0.1.0/src/lib.rs:144
   9:     0x55d0c5d67ebf - simple_server::Server::listen::{{closure}}::{{closure}}::h93a3c8a913685d2f
                               at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/simple-server-0.1.0/src/lib.rs:131
  10:     0x55d0c5d455e7 - <F as scoped_threadpool::FnBox>::call_box::h50b27dc8fe834905
                               at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/scoped_threadpool-0.1.8/src/lib.rs:71
  11:     0x55d0c5f294b8 - scoped_threadpool::Pool::new::{{closure}}::hbc55196e04c3a541
                               at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/scoped_threadpool-0.1.8/src/lib.rs:127
  12:     0x55d0c5f02632 - std::sys_common::backtrace::__rust_begin_short_backtrace::hfd3ed8d19e354d91
                               at /checkout/src/libstd/sys_common/backtrace.rs:136
  13:     0x55d0c5f04bfa - std::thread::Builder::spawn::{{closure}}::{{closure}}::he960c90ced50896a
                               at /checkout/src/libstd/thread/mod.rs:394
  14:     0x55d0c5efd9e2 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h0f9ae768cd5d11ec
                               at /checkout/src/libstd/panic.rs:296
  15:     0x55d0c5f04ef4 - std::panicking::try::do_call::h06767c0406f7d952
                               at /checkout/src/libstd/panicking.rs:480
  16:     0x55d0c5f42bdc - __rust_maybe_catch_panic
                               at /checkout/src/libpanic_unwind/lib.rs:99
  17:     0x55d0c5f04df5 - std::panicking::try::hcb7290c08c488e56
                               at /checkout/src/libstd/panicking.rs:459
  18:     0x55d0c5f04089 - std::panic::catch_unwind::h9881f8c99f6e055c
                               at /checkout/src/libstd/panic.rs:361
  19:     0x55d0c5f04a21 - std::thread::Builder::spawn::{{closure}}::h46421082e44024b0
                               at /checkout/src/libstd/thread/mod.rs:393
  20:     0x55d0c5f1e5e7 - <F as alloc::boxed::FnBox<A>>::call_box::hb93baed3fda5af3c
                               at /checkout/src/liballoc/boxed.rs:682
  21:     0x55d0c5f3ac6b - std::sys::imp::thread::Thread::new::thread_start::hf0e7be833820328e
                               at /checkout/src/liballoc/boxed.rs:692
                               at /checkout/src/libstd/sys_common/thread.rs:21
                               at /checkout/src/libstd/sys/unix/thread.rs:84
  22:     0x7fc9f0e0a493 - start_thread
  23:     0x7fc9f0935afe - __clone
  24:                0x0 - <unknown>
thread 'main' panicked at 'Thread pool worker panicked', /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/scoped_threadpool-0.1.8/src/lib.rs:236:12
stack backtrace:
   0:     0x55d0c5f39203 - std::sys::imp::backtrace::tracing::imp::unwind_backtrace::hfc7985b08e763a82
                               at /checkout/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1:     0x55d0c5f354c4 - std::sys_common::backtrace::_print::h16a1db02a59ead63
                               at /checkout/src/libstd/sys_common/backtrace.rs:71
   2:     0x55d0c5f3b813 - std::panicking::default_hook::{{closure}}::h48ecee46f2eefc30
                               at /checkout/src/libstd/sys_common/backtrace.rs:60
                               at /checkout/src/libstd/panicking.rs:381
   3:     0x55d0c5f3b582 - std::panicking::default_hook::hb4c92ae8d005ca44
                               at /checkout/src/libstd/panicking.rs:397
   4:     0x55d0c5f3bcd7 - std::panicking::rust_panic_with_hook::h25d461655d60b1a5
                               at /checkout/src/libstd/panicking.rs:611
   5:     0x55d0c5f04cc6 - std::panicking::begin_panic::hee8e45285f6b9409
                               at /checkout/src/libstd/panicking.rs:572
   6:     0x55d0c5f29901 - scoped_threadpool::Scope::join_all::h2bc64569a2fe3268
                               at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/scoped_threadpool-0.1.8/src/lib.rs:236
   7:     0x55d0c5f299ac - <scoped_threadpool::Scope<'pool, 'scope> as core::ops::drop::Drop>::drop::hcb2a5179f93c7f5f
                               at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/scoped_threadpool-0.1.8/src/lib.rs:248
   8:     0x55d0c5d51334 - core::ptr::drop_in_place::h5a52d60ff9e21911
                               at /checkout/src/libcore/ptr.rs:61
   9:     0x55d0c5d3daf5 - scoped_threadpool::Pool::scoped::hd46bb0e79e3c2378
                               at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/scoped_threadpool-0.1.8/src/lib.rs:182
  10:     0x55d0c5d67c9f - simple_server::Server::listen::ha0ad9e37103eb544
                               at /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/simple-server-0.1.0/src/lib.rs:129
  11:     0x55d0c5d3c635 - hello_world::main::ha53a3edcff9e5f20
                               at src/main.rs:20
  12:     0x55d0c5f42bdc - __rust_maybe_catch_panic
                               at /checkout/src/libpanic_unwind/lib.rs:99
  13:     0x55d0c5f3c3fb - std::rt::lang_start::hdcba96cc6d0f043d
                               at /checkout/src/libstd/panicking.rs:459
                               at /checkout/src/libstd/panic.rs:361
                               at /checkout/src/libstd/rt.rs:61
  14:     0x55d0c5d3cd22 - main
  15:     0x7fc9f086d2b0 - __libc_start_main
  16:     0x55d0c5d38b29 - _start
  17:                0x0 - <unknown>