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$ curl -XGET "http://localhost:9200" { "name" : "My-MacBook-Pro.local", "cluster_name" : "elasticsearch", "cluster_uuid" : "vEFl3B5TTYaBxPhQFuXPyQ", "version" : { "number" : "7.0.1", "build_flavor" : "default", "build_type" : "tar", "build_hash" : "e4efcb5", "build_date" : "2019-04-29T12:56:03.145736Z", "build_snapshot" : false, "lucene_version" : "8.0.0", "minimum_wire_compatibility_version" : "6.7.0", "minimum_index_compatibility_version" : "6.0.0-beta1" }, "tagline" : "You Know, for Search" }

$ iex -S mix Erlang/OTP 20 [erts-9.3] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:10] [hipe] [kernel-poll:false] ===> Compiling parse_trans ===> Compiling mimerl ===> Compiling metrics ===> Compiling unicode_util_compat ===> Compiling idna ==> ssl_verify_fun Compiling 7 files (.erl) Generated ssl_verify_fun app ===> Compiling certifi ===> Compiling hackney ==> httpoison Compiling 3 files (.ex) Generated httpoison app ==> hello Compiling 15 files (.ex) Generated hello app Interactive Elixir (1.6.6) - press Ctrl+C to exit (type h() ENTER for help) iex(1)> HTTPoison.get "http://localhost:9200" {:ok, %HTTPoison.Response{ body: "{\n \"name\" : \"My-MacBook-Pro.local\",\n \"cluster_name\" : \"elasticsearch\",\n \"cluster_uuid\" : \"vEFl3B5TTYaBxPhQFuXPyQ\",\n \"version\" : {\n \"number\" : \"7.0.1\",\n \"build_flavor\" : \"default\",\n \"build_type\" : \"tar\",\n \"build_hash\" : \"e4efcb5\",\n \"build_date\" : \"2019-04-29T12:56:03.145736Z\",\n \"build_snapshot\" : false,\n \"lucene_version\" : \"8.0.0\",\n \"minimum_wire_compatibility_version\" : \"6.7.0\",\n \"minimum_index_compatibility_version\" : \"6.0.0-beta1\"\n },\n \"tagline\" : \"You Know, for Search\"\n}\n", headers: [ {"content-type", "application/json; charset=UTF-8"}, {"content-length", "522"} ], request: %HTTPoison.Request{ body: "", headers: [], method: :get, options: [], params: %{}, url: "http://localhost:9200" }, request_url: "http://localhost:9200", status_code: 200 }} iex(2)>

您应该像这样读取json数据:

#!/usr/bin/env python3

import os
import sys
import json

content_len = int(os.environ["CONTENT_LENGTH"])

req_body = sys.stdin.read(content_len)
my_dict = json.loads(req_body)

使用以下代码,可能会遇到问题:

 myjson = json.load(sys.stdin)

或者写得不那么简洁:

requ_body = sys.stdin.read()
my_dict = json.load(requ_body)

那个做当我的cgi脚本在 apache 服务器,但你不能指望它能正常工作——正如我发现我的CGI脚本在另一台服务器上时所做的那样。根据CGI规范:

RFC 3875                    CGI Version 1.1                 October 2004


4.2.  Request Message-Body

   Request data is accessed by the script in a system-defined method;
   unless defined otherwise, this will be by reading the 'standard
   input' file descriptor or file handle.

      Request-Data   = [ request-body ] [ extension-data ]
      request-body   = <CONTENT_LENGTH>OCTET
      extension-data = *OCTET

   A request-body is supplied with the request if the CONTENT_LENGTH is
   not NULL.  The server MUST make at least that many bytes available
   for the script to read.  The server MAY signal an end-of-file
   condition after CONTENT_LENGTH bytes have been read or it MAY supply
   extension data.  Therefore, the script MUST NOT attempt to read more
   than CONTENT_LENGTH bytes, even if more data is available.  However,
   it is not obliged to read any of the data.

关键是:

脚本不能试图读取更多比内容长度字节长,即使有更多数据可用。

显然地, 阿帕奇 在向cgi脚本发送请求正文后立即向cgi脚本发送eof信号,这会导致 sys.stdin.read() 回来。但是根据cgi规范,服务器不需要在请求主体之后发送eof信号,我发现我的cgi脚本挂起了 系统stdin.read() --当我的脚本在另一台服务器上时,最终导致超时错误。

因此,为了在一般情况下读入json数据,您应该执行以下操作:

content_len = int(os.environ["CONTENT_LENGTH"])

req_body = sys.stdin.read(content_len)
my_dict = json.loads(req_body)

服务器为cgi脚本设置一组环境变量,这些变量包含头信息,其中之一是内容长度。

下面是当我使用 myjson = json.load(sys.stdin) :

-v      verbose output
-H      specify one header
--data  implicitly specifies a POST request 

Note that curl automatically calculates a Content-Length header 
for you.

~$ curl -v \
> -H 'Content-Type: application/json' \
> --data '{"a": 1, "b": 2}' \
> http://localhost:65451/cgi-bin/1.py

*   Trying ::1...
* TCP_NODELAY set
* Connection failed
* connect to ::1 port 65451 failed: Connection refused
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 65451 (#0)
> POST /cgi-bin/1.py HTTP/1.1
> Host: localhost:65451
> User-Agent: curl/7.58.0
> Accept: */*
> Content-Type: application/json
> Content-Length: 16
> 
* upload completely sent off: 16 out of 16 bytes

=== hung here for about 5 seconds ====

< HTTP/1.1 504 Gateway Time-out
< Date: Thu, 08 Mar 2018 17:53:30 GMT
< Content-Type: text/html
< Server: inets/6.4.5
* no chunk, no close, no size. Assume close to signal end
< 
* Closing connection 0