fastapi X-Custom-Header

FastAPI中的`X-Custom-Header`通常指的是在HTTP请求或响应中设置或获取自定义的HTTP头字段。在FastAPI中，你可以通过定义函数参数或使用依赖项注入的方式来接收和设置自定义的HTTP头。

当你需要在FastAPI应用中获取自定义HTTP头时，可以将函数参数设置为`Header(...)`，这样FastAPI会自动从请求头中提取对应的字段。而如果你想在响应中添加一个自定义HTTP头，可以在返回响应时使用`response.headers`字典来设置。

示例代码如下：

from fastapi import FastAPI, Header

app = FastAPI()

@app.get("/items/")
async def read_items(x_token: str = Header(...)):
    return {"X-Token values": x_token}

@app.get("/users/me")
async def read_user_me(response: Response):
    response.headers["X-Custom-Header"] = "MyValue"
    return {"message": "Hello World"}

在上述例子中，`/items/` 路径操作期望从请求头中获取`X-Token`字段，并将其作为参数`x_token`传递给函数。而`/users/me`路径操作则在响应中添加了一个`X-Custom-Header`头。

相关问题

python3 fastapi异步框架中间件

在 Python3 FastAPI 中，中间件可以拦截请求和响应，并对它们进行处理。中间件是一个在应用程序处理请求之前或之后插入的函数。中间件用于实现各种功能，例如身份验证、日志记录、错误处理等。

在 FastAPI 中，中间件是通过添加一个包含请求和响应处理逻辑的异步函数来实现的。例如：

from fastapi import FastAPI

app = FastAPI()

@app.middleware("http")
async def add_custom_header(request, call_next):
    response = await call_next(request)
    response.headers["X-Custom-Header"] = "Hello World"
    return response

在上面的代码中，我们添加了一个名为`add_custom_header`的中间件，它将在每个 HTTP 请求被处理之前被调用。这个中间件函数接收两个参数，一个是请求对象，一个是调用下一个中间件/路由处理函数的异步函数。在这个中间件函数中，我们可以通过异步调用`call_next(request)`来将请求传递给下一个中间件或路由处理函数，然后在响应对象上添加一个自定义头部，并将响应返回。

curl --help

当您在命令行中输入"curl --help"时，将会显示curl的所有参数和选项，例如：

Usage: curl [options...] <url>
     --abstract-unix-socket <path> Connect via abstract Unix domain socket
     --alt-svc <AltSvcString>   Alternate service to connect to
     --anyauth                 Pick any authentication method
-b, --cookie <name=data>      Cookie string to send to server(s)
     --cookie-jar <file>      File to save response cookies to
     --create-dirs            Create necessary local directory hierarchy
     --crlf                    Convert LF to CRLF in upload
     --crlfile <file>         Use this CRL file
     --data-binary <data>     HTTP POST binary data
     --data-raw <data>        HTTP POST data
     --data-urlencode <data>  HTTP POST data url encoded
     --delegation <LEVEL>     GSS-API delegation permission
     --digest                  Use HTTP Digest Authentication
     --disable-eprt           Inhibit using EPRT or LPRT
     --disable-epsv           Inhibit using EPSV
     --disallow-username-in-url Disallow username in url
 -D, --dump-header <file>      Write headers to <file>
     --egd-file <file>        EGD socket path for random data
     --engine <name>          Crypto engine to use
     --expect100-timeout <seconds> How long to wait for 100-continue
     --fail-early             Fail on first transfer error, do not continue
 -f, --fail                   Fail silently (no output at all) on HTTP errors
     --false-start            Enable TLS False Start
 -F, --form <name=content>    Specify multipart MIME data
     --form-string <name=string> Specify multipart MIME data
     --ftp-account <data>     Account data string
     --ftp-alternative-to-user <command> String to replace "USER [name]".
     --ftp-create-dirs        Create the remote dirs if not present
     --ftp-method [multicwd/nocwd/singlecwd] Control CWD usage.
     --ftp-pasv               Use PASV/EPSV instead of PORT
 -P, --ftp-port <address>     Use PORT with address instead of PASV
     --ftp-pret              Send PRET before PASV
     --ftp-ssl-ccc           Send CCC after authenticating
     --ftp-ssl-ccc-mode [active/passive] Set CCC mode
     --ftp-ssl-control       Require SSL/TLS for FTP login, clear for transfer
 -G, --get                    Put the post data in the URL and use GET
     --globoff                Disable URL sequences and ranges using {} and []
 -H, --header <header>        Pass custom header(s) to server
 -h, --help                   This help text
     --hostpubmd5 <md5>       Hex-encoded MD5 string of the host public key. (SSH)
 -0, --http1.0                Use HTTP 1.0
     --http1.1                Use HTTP 1.1
     --http2-prior-knowledge Use HTTP/2 without HTTP/1.1 Upgrade
     --http2                  Use HTTP 2
 -i, --include                Include protocol response headers in the output
     --insecure               Allow insecure server connections when using SSL
 -I, --head                   Show document info only
 -j, --junk-session-cookies  Ignore session cookies read from file
     --keepalive-time <seconds> Interval between keepalive probes
     --key <key>             Private key file name
     --key-type <type>       Private key file type (DER/PEM/ENG)
     --krb <level>           Enable Kerberos with specified security level
     --libcurl <file>        Dump libcurl equivalent code of this command line
     --limit-rate <speed>    Limit transfer speed to RATE
 -l, --list-only              List only mode
     --local-port <num>      Force use of RANGE for local port numbers
 -L, --location               Follow redirects
     --location-trusted      Like --location, and send auth to other hosts
     --login-options <options> Server login options
 -M, --manual                 Display the full manual
     --mail-from <from>      Mail from this address
     --mail-rcpt <to>        Mail to this/these addresses
     --mail-auth <address>   Originator address of the original email
     --max-filesize <bytes>  Maximum file size to download (bytes)
     --max-redirs <num>      Maximum number of redirects allowed
 -m, --max-time <seconds>     Maximum time allowed for the transfer
     --metalink              Process given URLs as metalink XML file
     --negotiate             Use HTTP Negotiate (SPNEGO) authentication
 -n, --netrc                  Use netrc authentication
     --netrc-file <filename> Specify FILE for netrc
 -N, --no-buffer              Disable buffering of the output stream
     --no-keepalive          Disable TCP keepalive on the connection
     --no-sessionid          Disable SSL session-ID reusing
     --noproxy <no-proxy-list> Do not use proxy for these hosts/networks
     --ntlm                  Use HTTP NTLM authentication
     --oauth2-bearer <token> OAuth 2 Bearer Token
 -o, --output <file>          Write to file instead of stdout
     --pass <phrase>         Pass phrase for the private key
     --path-as-is            Do not squash .. sequences in URL path
     --pinnedpubkey <hashes> FILE/HASHES Public key to verify peer against
 -p, --proxytunnel            Operate through a HTTP proxy tunnel (using CONNECT)
     --proto <protocols>     Enable/disable specified protocols
     --proto-default <protocol> Use this protocol if none is specified
     --proto-redir <protocols> Enable/disable specified protocols on redirect
 -x, --proxy [protocol://]host[:port] Use this proxy
     --proxy-anyauth         Pick any proxy authentication method
     --proxy-basic           Use Basic authentication on the proxy
     --proxy-digest          Use Digest authentication on the proxy
     --proxy-header <header> Pass custom header(s) to proxy
     --proxy-ntlm            Use NTLM authentication on the proxy
     --proxy-service-name <name> SPNEGO proxy service name
     --proxy-tlsv1           Use TLSv1 for proxy
     --proxy-tlsv1.0         Use TLSv1.0 for proxy
     --proxy-tlsv1.1         Use TLSv1.1 for proxy
     --proxy-tlsv1.2         Use TLSv1.2 for proxy
     --proxy-tlsv1.3         Use TLSv1.3 for proxy
     --proxy1.0              Use HTTP/1.0 proxy on given port
 -U, --proxy-user <user:password> Proxy user and password
     --proxy1.1              Use HTTP/1.1 proxy on given port
     --pubkey <key>          Public key file name
 -Q, --quote                 Send command(s) to server before transfer
     --random-file <file>    File for reading random data from
 -r, --range <range>          Retrieve only the bytes within RANGE
     --raw                   Do HTTP "raw"; no transfer decoding
     --remote-header-name    Use the header-provided filename
     --remote-name-all       Use the remote file name for all URLs
 -O, --remote-name            Write output to a file named as the remote file
     --remote-time           Set the remote file's time on the local output
     --request-target        Use this request target instead of the URL
 -s, --silent                 Silent mode (don't output anything)
     --socks4 <host[:port]>  SOCKS4 proxy on given host + optional port number
     --socks4a <host[:port]> SOCKS4a proxy on given host + optional port number
     --socks5 <host[:port]>  SOCKS5 proxy on given host + optional port number
     --socks5-basic          Enable username/password auth for SOCKS5 proxies
     --socks5-gssapi         Enable GSS-API auth for SOCKS5 proxies
     --socks5-gssapi-nec     Compatibility with NEC SOCKS5 server
     --socks5-gssapi-service <name> SOCKS5 proxy service name for GSS-API
     --socks5-gssapi-service-principal <name> SOCKS5 proxy service principal for GSS-API
     --socks5-gssapi-service-credential <file> SOCKS5 proxy service credential for GSS-API
     --socks5-hostname <host[:port]> SOCKS5 proxy, pass host name to proxy
     --speed-limit <speed>   Stop transfers slower than this
     --speed-time <seconds>  Trigger 'speed-limit' abort after this time
     --ssl                   Try SSL/TLS
     --ssl-reqd              Require SSL/TLS
 -2, --sslv2                  Use SSLv2
 -3, --sslv3                  Use SSLv3
     --stderr <file>         Where to redirect stderr
     --styled-output         Enable styled output for HTTP headers
     --suppress-connect-headers Suppress proxy CONNECT response headers
     --tcp-fastopen          Use TCP Fast Open
     --tcp-nodelay           Use the TCP_NODELAY option
     --tcp-user-timeout <msecs> How long to wait for TCP connect to succeed
 -t, --telnet-option <OPT=val> Set telnet option
     --tftp-blksize <value>  Set TFTP BLKSIZE option
     --tftp-no-options       Do not send TFTP options requests
 -z, --time-cond <time>       Transfer based on a time condition
 -1, --tlsv1                 Use TLSv1.0 or greater
     --tlsv1.0               Use TLSv1.0 or greater
     --tlsv1.1               Use TLSv1.1 or greater
     --tlsv1.2               Use TLSv1.2 or greater
     --tlsv1.3               Use TLSv1.3 or greater
 -t, --trace <file>           Write a debug trace to FILE
     --trace-ascii <file>    Like --trace, but without the hex output
     --trace-time            Add time stamps to trace/verbose output
     --tr-encoding           Request compressed transfer encoding
 -T, --upload-file <file>     Transfer local FILE to destination
     --url <url>             URL to work with
 -B, --use-ascii              Use ASCII/text transfer
 -u, --user <user:password>   Server user and password
 -A, --user-agent <string>    Send User-Agent <string> to server
 -v, --verbose                Make the operation more talkative
 -V, --version                Show version number and quit
 -w, --write-out <format>     Use output FORMAT after completion
     --xattr                 Store metadata in extended file attributes

这是一个非常详细的curl参数列表，包括了许多高级选项和功能。如果您想深入了解curl的用法和技巧，可以参考官方文档或者其他的curl教程。