Question

我正在尝试使用tesla发出发布请求，但出现错误：

(CaseClauseError) no case clause matching: %{name: "ecdebit"}
(hackney) /deps/hackney/src/hackney_request.erl:312::hackney_request.handle_body/4
(hackney) /deps/hackney/src/hackney_request.erl:81::hackney_request.perform/2
(hackney) /deps/hackney/src/hackney.erl:372::hackney.send_request/2
(tesla) lib/tesla/adapter/hackney.ex:69: Tesla.Adapter.Hackney.request/5
(tesla) lib/tesla/adapter/hackney.ex:31: Tesla.Adapter.Hackney.call/2

我的请求代码是

request_body = %{
  name: "ecdebit",
}
Tesla.post(client, "/contactdb/lists", request_body)

特斯拉基本URL中的

是：https://api.sendgrid.com/v3，还设置了授权key。我们如何传递数据以进行后期请求？

与tesla文档中的一样，将发布请求定义为：

Tesla.post("http://httpbin.org/post", "data", headers: [{"content-type", "application/json"}])

在这个星球上，有没有人可以帮助摆脱这种故障:(。

Answer 1

您对Tesla.post()文档的引用：

Tesla.post("http://httpbin.org/post", 
            "data", 
            headers: [{"content-type", "application/json"}])

显示第一个参数是包含url的字符串，第二个参数是包含数据的字符串，第三个参数是关键字列表。但是，当您调用Tesla.post()时，您将路径作为第二个参数，并将Elixir映射作为第三个参数：

Tesla.post(client, 
           "/contactdb/lists", 
           request_body)

在这里，您可以利用特斯拉的功能将请求逐步转换为所需的内容：

1）创建一个混合项目：

~/elixir_programs$ mix new http
* creating README.md
* creating .formatter.exs
* creating .gitignore
* creating mix.exs
* creating config
* creating config/config.exs
* creating lib
* creating lib/http.ex
* creating test
* creating test/test_helper.exs
* creating test/http_test.exs

Your Mix project was created successfully.
You can use "mix" to compile it, test it, and more:

    cd http
    mix test

Run "mix help" for more commands.

~/elixir_programs$ cd http

2）将jason，hackney和tesla作为依赖项添加到mix.ex文件中：

  defp deps do
    [
      {:jason, "~> 1.0"}, #for tesla JSON middleware
      {:hackney, "~> 1.14.0"}, #recommended for tesla
      {:tesla, "~> 1.2.1"}, #http requests

      # {:dep_from_hexpm, "~> 0.3.0"},
      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"},
    ]
  end

3）将lib/http.ex更改为以下内容：

defmodule Http do

  use Tesla

  plug Tesla.Middleware.BaseUrl, "https://webhook.site/ab8b7259-feb4-4e62-b8dd-46bb03b614ba"
  plug Tesla.Middleware.FormUrlencoded

  #plug Tesla.Middleware.Headers, [{"header-name", "header-value"}]

  def go do  #Use this function to test whether a Tesla request succeeds without having to repeatedly type the following variables and their values into iex.
    request_body = %{name: "Joel", age: 21}
    path = "/" 
    post(path, request_body)  #Outside of this module, you would need to write Http.post(...)
  end

end

当您指定Tesla.Middleware.BaseUrl时，Tesla将自动将基本URL放在您指定为post()函数中第一个参数的字符串之前（除非该字符串以“ http”或“ https”开头）。

当您指定Tesla.Middleware.FormUrlencoded时，Tesla会自动将作为post()函数的第二个参数给出的Elixir映射转换为网页上的表单发送到服务器的格式，看起来像像这样：

"name=Joel&age=21"

Tesla还会自动将以下标头添加到请求中：

Contet-Type: application/x-www-form-urlencoded

如果您希望Tesla将Elixir映射转换为json字符串，请改为指定Tesla.Middleware.JSON（请注意，这需要jason在依赖项中）。 Tesla还将自动将以下标头添加到请求中：

 Contet-Type: application/json

当您指定Tesla.Middleware.Headers时，特斯拉会自动将指定的标头添加到您的所有请求中。

现在在iex中试用：

~/elixir_programs/http$ iex -S Mix
...
...

iex(1)> {:ok, response} = Http.go
{:ok,
 %Tesla.Env{
   __client__: %Tesla.Client{adapter: nil, fun: nil, post: [], pre: []},
   __module__: Http,
   body: "",
   headers: [
     {"cache-control", "no-cache"},
     {"connection", "keep-alive"},
     {"date", "Thu, 29 Nov 2018 03:56:49 GMT"},
     {"server", "nginx/1.10.3"},
     {"vary", "Accept-Encoding"},
     {"content-length", "0"},
     {"content-type", "text/plain; charset=UTF-8"},
     {"x-request-id", "55a92302-6459-49bc-b7eb-f3e7ff037599"},
     {"x-token-id", "ab8b7259-feb4-4e62-b8dd-46bb03b614ba"},
     {"x-ratelimit-limit", "30"},
     {"x-ratelimit-remaining", "29"},
     {"strict-transport-security", "max-age=63072000; includeSubdomains"},
     {"x-frame-options", "DENY"},
     {"x-content-type-options", "nosniff"}
   ],
   method: :post,
   opts: [],
   query: [],
   status: 200,
   url: "https://webhook.site/ab8b7259-feb4-4e62-b8dd-46bb03b614ba/"
 }}

格式化的输出是响应。在网站webhook.site上，我可以看到请求（单击图像将其放大）：

并设置授权密钥

特斯拉有two middleware modules for authorization：

Tesla.Middleware.BasicAuth 
Tesla.Middleware.DigestAuth

如何在长生不老药中使用特斯拉发出发布请求

1 个答案: