在使用Go语言向本地服务器发出GET HTTP请求时，返回了空响应。

huangapple
go评论131阅读模式
英文:

Empty response while making a GET http request to the localhost server using Go

问题

我有一个正在运行的本地服务器，实际上就是一个在Docker中的容器进程。我正在尝试实现一个Go客户端来构建用于创建、列出、更新和删除功能的REST API。当我尝试访问URL时，程序成功退出，但是返回了一个空响应。进一步观察，我发现响应类型是"chunked"，内容长度为-1。我对Go还不熟悉，正在努力找出可能的原因，或者是否有人能提供解决这个问题的解决方案。以下是我的代码：

  1. package main
  3. import (
  4. 	"encoding/json"
  5. 	"fmt"
  6. 	"io/ioutil"
  7. 	"net/http"
  8. )
  10. type Payload struct {
  11. 	Stuff Data
  12. }
  14. type Data struct {
  15. 	Id              string
  16. 	Links           Links_container
  17. 	Actions         Actions_container
  18. 	AccountID       string
  19. 	AgentID         string
  20. 	AllocationState string
  21. 	Compute         string
  22. 	Created         string
  23. }
  25. type Links_container map[string]string
  26. type Actions_container map[string]string
  28. func main() {
  29. 	url := "http://localhost:8080/v1/containers"
  30. 	res, err := http.Get(url)
  31. 	if err != nil {
  32. 		fmt.Println(err)
  33. 	}
  34. 	defer res.Body.Close()
  35. 	body, err := ioutil.ReadAll(res.Body)
  36. 	if err != nil {
  37. 		fmt.Println(err)
  38. 	}
  40. 	var p Payload
  42. 	err = json.Unmarshal(body, &p)
  43. 	if err != nil {
  44. 		panic(err)
  45. 	}
  47. 	fmt.Println(p.Stuff.AccountID, "\n", p.Stuff.Actions, "\n",
  48. 		p.Stuff.AgentID, "\n", p.Stuff.AllocationState, "\n", p.Stuff.Compute,
  49. 		"\n", p.Stuff.Created, "\n", p.Stuff.Id, "\n", p.Stuff.Links)
  50. }

输出结果为：

  1. map[]
  3. map[]

这是服务器返回的JSON输出：

  1. {
  2.     "type": "collection",
  3.     "resourceType": "container",
  4.     "links": {
  5.         "self": ".../v1/containers"
  6.     },
  7.     "createTypes": {},
  8.     "actions": {},
  9.     "data": [
  10.         {
  11.             "id": "1i2",
  12.             "type": "container",
  13.             "links": { ... },
  14.             "actions": { ... },
  15.             "accountId": "1a1",
  16.             "agentId": null,
  17.             "allocationState": "active",
  18.             "compute": null,
  19.             "created": "2014-11-13T23:47:08Z",
  20.             "createdTS": 1415922428119,
  21.             "data": { ... },
  22.             "description": null,
  23.             "domain": null,
  24.             "firstRunning": "2014-11-13T23:49:16Z",
  25.             "firstRunningTS": 1415922556030,
  26.             "hostname": null,
  27.             "imageId": "1i1",
  28.             "imageUuid": "docker:dockerfile/ghost:latest",
  29.             "instanceTriggeredStop": "stop",
  30.             "kind": "container",
  31.             "memoryMb": 256,
  32.             "name": "dockercontainer",
  33.             "primaryAssociatedIpAddress": null,
  34.             "primaryIpAddress": "0.0.0.0.",
  35.             "removeTime": null,
  36.             "removed": null,
  37.             "requestedHostId": "1h1",
  38.             "startOnCreate": true,
  39.             "state": "running",
  40.             "token": "xyz",
  41.             "transitioning": "no",
  42.             "transitioningMessage": null,
  43.             "transitioningProgress": null,
  44.             "userdata": null,
  45.             "uuid": "29614f31-4322-4af4-9a55-d9c9395f5cb7",
  46.             "validHostIds": null,
  47.             "zoneId": "1z1",
  48.             "environment": {},
  49.             "command": null,
  50.             "commandArgs": [],
  51.             "directory": null,
  52.             "user": null,
  53.             "publishAllPorts": false,
  54.             "privileged": false,
  55.             "dockerVolumes": null,
  56.             "ports": []
  57.         },
  58.         { ... }
  59.     ],
  60.     "sortLinks": { ... },
  61.     "pagination": { ... },
  62.     "sort": null,
  63.     "filters": { ... },
  64.     "createDefaults": {}
  65. }

希望对你有帮助！

英文:

I have my localhost server running which is nothing but the container process in a docker.I am trying to implement a Go CLIENT to build REST api's for Create, List, Update, Delete functionalities. When I try to hit the URL, the program exits successfully but gives me an empty response. Further I observed, that the response type is "chunked" with the content length as -1. I am new to Go and trying to figure out what could be the possible reasons or could anyone provide a solution to this problem. Here it my code -
{

  1.  package main
  2. import (
  3. "encoding/json"
  4. "fmt"
  5. "io/ioutil"
  6. "net/http"
  7. )
  8. type Payload struct {
  9. Stuff Data
  10. }
  11. type Data struct {
  12. Id              string
  13. Links           Links_container
  14. Actions         Actions_container
  15. AccountID       string
  16. AgentID         string
  17. AllocationState string
  18. Compute         string
  19. Created         string
  20. }
  21. type Links_container map[string]string
  22. type Actions_container map[string]string
  23. func main() {
  24. url := "http://localhost:8080/v1/containers"
  25. res, err := http.Get(url)
  26. if err != nil {
  27. fmt.Println(err)
  28. }
  29. defer res.Body.Close()
  30. body, err := ioutil.ReadAll(res.Body)
  31. if err != nil {
  32. fmt.Println(err)
  33. }
  34. var p Payload
  35. err = json.Unmarshal(body, &p)
  36. if err != nil {
  37. panic(err)
  38. }
  39. fmt.Println(p.Stuff.AccountID, "\n", p.Stuff.Actions, "\n",
  40. p.Stuff.AgentID, "\n", p.Stuff.AllocationState, "\n", p.Stuff.Compute,
  41. "\n", p.Stuff.Created, "\n", p.Stuff.Id, "\n", p.Stuff.Links)
  42. }

}

Output-

map[]

map[]

This is the JSON output from the server -

{

  1. "type": "collection",
  2. "resourceType": "container",
  3. "links": {
  4. "self": "…/v1/containers",
  5. },
  6. "createTypes": { },
  7. "actions": { },
  8. "data": [ 2 items
  9. {
  10. "id": "1i2",
  11. "type": "container",
  12. "links": { … },
  13. "actions": { … },
  14. "accountId": "1a1",
  15. "agentId": null,
  16. "allocationState": "active",
  17. "compute": null,
  18. "created": "2014-11-13T23:47:08Z",
  19. "createdTS": 1415922428119,
  20. "data": { … },
  21. "description": null,
  22. "domain": null,
  23. "firstRunning": "2014-11-13T23:49:16Z",
  24. "firstRunningTS": 1415922556030,
  25. "hostname": null,
  26. "imageId": "1i1",
  27. "imageUuid": "docker:dockerfile/ghost:latest",
  28. "instanceTriggeredStop": "stop",
  29. "kind": "container",
  30. "memoryMb": 256,
  31. "name": "dockercontainer",
  32. "primaryAssociatedIpAddress": null,
  33. "primaryIpAddress": "0.0.0.0.",
  34. "removeTime": null,
  35. "removed": null,
  36. "requestedHostId": "1h1",
  37. "startOnCreate": true,
  38. "state": "running",
  39. "token": "xyz",
  40. "transitioning": "no",
  41. "transitioningMessage": null,
  42. "transitioningProgress": null,
  43. "userdata": null,
  44. "uuid": "29614f31-4322-4af4-9a55-d9c9395f5cb7",
  45. "validHostIds": null,
  46. "zoneId": "1z1",
  47. "environment": { },
  48. "command": null,
  49. "commandArgs": [ ],
  50. "directory": null,
  51. "user": null,
  52. "publishAllPorts": false,
  53. "privileged": false,
  54. "dockerVolumes": null,
  55. "ports": [ ],
  56. },
  57. { … },
  58. ],
  59. "sortLinks": { … },
  60. "pagination": { … },
  61. "sort": null,
  62. "filters": { … },
  63. "createDefaults": { },

}

答案1

得分: 2

有几个需要更改的地方才能使其正常工作。

你粘贴的JSON不是有效的（可以使用linter进行检查）。一旦确定输入的是有效的JSON，需要修改Go代码如下：

  • 字段需要使用选项进行“装饰”，告诉JSON解析器字段的名称是什么。
  • Payload 结构体根据你提供的JSON描述包含一个 Data 切片。

修改后的代码如下：

  1. package main
  3. import (
  4. 	"encoding/json"
  5. 	"fmt"
  6. 	"io/ioutil"
  7. 	"net/http"
  8. )
  10. type Payload struct {
  11. 	Stuff []Data `json:"data"`
  12. }
  14. type Data struct {
  15. 	Id              string            `json:"id"`
  16. 	Links           Links_container   `json:"links"`
  17. 	Actions         Actions_container `json:"actions"`
  18. 	AccountID       string            `json:"accountId"`
  19. 	AgentID         string            `json:"agentId"`
  20. 	AllocationState string            `json:"allocationState"`
  21. 	Compute         string            `json:"compute"`
  22. 	Created         string            `json:"created"`
  23. }
  25. type Links_container map[string]string
  26. type Actions_container map[string]string
  28. func main() {
  29. 	url := "http://localhost:8080/v1/containers"
  30. 	res, err := http.Get(url)
  31. 	if err != nil {
  32. 		fmt.Println(err)
  33. 	}
  34. 	defer res.Body.Close()
  35. 	body, err := ioutil.ReadAll(res.Body)
  36. 	if err != nil {
  37. 		fmt.Println(err)
  38. 	}
  40. 	var p Payload
  42. 	err = json.Unmarshal(body, &p)
  43. 	if err != nil {
  44. 		panic(err)
  45. 	}
  47. 	for _, stuff := range p.Stuff {
  48. 		fmt.Println(stuff.AccountID, "\n", stuff.Actions, "\n",
  49. 			stuff.AgentID, "\n", stuff.AllocationState, "\n", stuff.Compute,
  50. 			"\n", stuff.Created, "\n", stuff.Id, "\n", stuff.Links)
  51. 	}
  52. }

你可以在sandbox中找到一个可工作的版本。

英文:

There are several things that you need to change to make it work.

The JSON you pasted is not valid (check on it with a linter). Once you are sure that what is coming in is valid JSON, the go code needs to be modified as follows:

  • Fields need to be "decorated" with options that tell the JSON parser what the field names are
  • The Payload struct contains a slice of Data based on the JSON description you provided

The modified code would look then:

  1. package main
  2. import (
  3. "encoding/json"
  4. "fmt"
  5. "io/ioutil"
  6. "net/http"
  7. )
  8. type Payload struct {
  9. Stuff []Data `json:"data"`
  10. }
  11. type Data struct {
  12. Id              string            `json:"id"`
  13. Links           Links_container   `json:"links"`
  14. Actions         Actions_container `json:"actions"`
  15. AccountID       string            `json:"accountId"`
  16. AgentID         string            `json:"agentId"`
  17. AllocationState string            `json:"allocationState"`
  18. Compute         string            `json:"compute"`
  19. Created         string            `json:"created"`
  20. }
  21. type Links_container map[string]string
  22. type Actions_container map[string]string
  23. func main() {
  24. url := "http://localhost:8080/v1/containers"
  25. res, err := http.Get(url)
  26. if err != nil {
  27. fmt.Println(err)
  28. }
  29. defer res.Body.Close()
  30. body, err := ioutil.ReadAll(res.Body)
  31. if err != nil {
  32. fmt.Println(err)
  33. }
  34. var p Payload
  35. err = json.Unmarshal(body, &p)
  36. if err != nil {
  37. panic(err)
  38. }
  39. for _, stuff := range p.Stuff {
  40. fmt.Println(stuff.AccountID, "\n", stuff.Actions, "\n",
  41. stuff.AgentID, "\n", stuff.AllocationState, "\n", stuff.Compute,
  42. "\n", stuff.Created, "\n", stuff.Id, "\n", stuff.Links)
  43. }
  44. }

Here you have a working version in the sandbox

huangapple
  • 本文由 发表于 2014年11月15日 15:23:29
  • 转载请务必保留本文链接：https://go.coder-hub.com/26943619.html
  • docker
  • go
  • http
  • rest
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