多重对象 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187 宏生成代码 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 19 元编程 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 19.4 代码生成 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 19 19.5 非标准字符串字面量 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204 19.6 生成函数 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 一个高级的例子

for example if the user wants to cancel a download. Downloads.Response – Type. struct Response proto :: String url :: String status :: Int message :: String headers :: Vector{Pair{String,String}} the properties of a successful response to a request as an object. It has the following fields: • proto: the protocol that was used to get the response • url: the URL that was ultimately requested after municating over secure transports like TLS or SSH. The url argument may be: 1. a proper URL staring with proto:// 2. an ssh-style bare host name or host name prefixed with user@ 3. an scp-style host as above

for example if the user wants to cancel a download. Downloads.Response – Type. struct Response proto :: String url :: String status :: Int message :: String headers :: Vector{Pair{String,String}} the properties of a successful response to a request as an object. It has the following fields: • proto: the protocol that was used to get the response • url: the URL that was ultimately requested after municating over secure transports like TLS or SSH. The url argument may be: 1. a proper URL staring with proto:// 2. an ssh-style bare host name or host name prefixed with user@ 3. an scp-style host as above

is thrown or returned. Downloads.Response – Type. CHAPTER 69. DOWNLOADS 1019 struct Response proto :: String url :: String status :: Int message :: String headers :: Vector{Pair{String,String}} the properties of a successful response to a request as an object. It has the following fields: • proto: the protocol that was used to get the response • url: the URL that was ultimately requested after nicating over secure transports like TLS or SSH. The url argument may be: 1. a proper URL staring with proto:// 2. an ssh-style bare host name or host name prefixed with user@ 3. an scp-style host as above

for example if the user wants to cancel a download. Downloads.Response – Type. struct Response proto :: String url :: String status :: Int message :: String headers :: Vector{Pair{String,String}} the properties of a successful response to a request as an object. It has the following fields: • proto: the protocol that was used to get the response • url: the URL that was ultimately requested after municating over secure transports like TLS or SSH. The url argument may be: 1. a proper URL staring with proto:// 2. an ssh-style bare host name or host name prefixed with user@ 3. an scp-style host as above

for example if the user wants to cancel a download. Downloads.Response – Type. struct Response proto :: String url :: String status :: Int message :: String headers :: Vector{Pair{String,String}} the properties of a successful response to a request as an object. It has the following fields: • proto: the protocol that was used to get the response • url: the URL that was ultimately requested after municating over secure transports like TLS or SSH. The url argument may be: 1. a proper URL staring with proto:// 2. an ssh-style bare host name or host name prefixed with user@ 3. an scp-style host as above

at all, then a RequestError is thrown or returned. Downloads.Response – Type. struct Response proto :: String url :: String status :: Int message :: String headers :: Vector{Pair{String,String}} the properties of a successful response to a request as an object. It has the following fields: • proto: the protocol that was used to get the response • url: the URL that was ultimately requested after municating over secure transports like TLS or SSH. The url argument may be: 1. a proper URL staring with proto:// 2. an ssh-style bare host name or host name prefixed with user@ 3. an scp-style host as above

at all, then a RequestError is thrown or returned. Downloads.Response – Type. struct Response proto :: String url :: String status :: Int message :: String headers :: Vector{Pair{String,String}} the properties of a successful response to a request as an object. It has the following fields: • proto: the protocol that was used to get the response • url: the URL that was ultimately requested after municating over secure transports like TLS or SSH. The url argument may be: 1. a proper URL staring with proto:// 2. an ssh-style bare host name or host name prefixed with user@ 3. an scp-style host as above

at all, then a RequestError is thrown or returned. Downloads.Response – Type. struct Response proto :: String url :: String status :: Int message :: String headers :: Vector{Pair{String,String}} the properties of a successful response to a request as an object. It has the following fields: • proto: the protocol that was used to get the response • url: the URL that was ultimately requested after municating over secure transports like TLS or SSH. The url argument may be: 1. a proper URL staring with proto:// 2. an ssh-style bare host name or host name prefixed with user@ 3. an scp-style host as above

at all, then a RequestError is thrown or returned. Downloads.Response – Type. struct Response proto :: String url :: String status :: Int message :: String headers :: Vector{Pair{String,String}} the properties of a successful response to a request as an object. It has the following fields: • proto: the protocol that was used to get the response • url: the URL that was ultimately requested after municating over secure transports like TLS or SSH. The url argument may be: 1. a proper URL staring with proto:// 2. an ssh-style bare host name or host name prefixed with user@ 3. an scp-style host as above