How to send POST request with JSON Body through HttpWebRequest
This article introduces the knowledge of "how C # sends POST requests with JSON Body through HttpWebRequest". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!
Catalogue
The original way of handling
A new way
The original way of handling
Obtain the request flow through GetRequestStream, and then write the Json data to be sent to the stream
Private T PostDataViaHttpWebRequest (string baseUrl, IReadOnlyDictionary headers, IReadOnlyDictionary urlParas, string requestBody=null) {var resuleJson = string.Empty; try {var apiUrl = baseUrl If (urlParas! = null) urlParas.ForEach (p = > {if (apiUrl.IndexOf ("{" + p.Key + "}") >-1) {apiUrl = apiUrl.Replace ("{" + p.Key + "}", p.Value) } else {apiUrl + = string.Format ("{0} {1} = {2}", apiUrl.Contains ("?")? "&": ", p.Key, p.Value) }}); var req = (HttpWebRequest) WebRequest.Create (apiUrl); req.Method = "POST"; req.ContentType = "application/json"; req.ContentLength = 0 If (! requestBody.IsNullOrEmpty ()) {using (var postStream = req.GetRequestStream ()) {var postData = Encoding.ASCII.GetBytes (requestBody); req.ContentLength = postData.Length; postStream.Write (postData, 0, postData.Length) }} if (headers! = null) {if (headers.Keys.Any (p = > p.ToLower () = = "content-type")) req.ContentType = headers.SingleOrDefault (p = > p.Key.ToLower () = = "content-type") .Value If (headers.Keys.Any (p = > p.ToLower () = = "accept")) req.Accept = headers.SingleOrDefault (p = > p.Key.ToLower () = = "accept"). Value;} var response = (HttpWebResponse) req.GetResponse () Using (Stream stream = response.GetResponseStream ()) {using (StreamReader reader = new StreamReader (stream, Encoding.GetEncoding ("UTF-8") {resuleJson = reader.ReadToEnd () } catch (Exception ex) {return default (T);} return JsonConvert.DeserializeObject (resuleJson);}
But you will find that the data has not been sent normally, and the code is quite complex.
A new way
Here, modify the way you write to RequestStream, wrap it with StreamWriter, and then write the Json data to be sent directly.
Private T PostDataViaHttpWebRequest (string baseUrl, IReadOnlyDictionary headers, IReadOnlyDictionary urlParas, string requestBody=null) {var resuleJson = string.Empty; try {var apiUrl = baseUrl If (urlParas! = null) urlParas.ForEach (p = > {if (apiUrl.IndexOf ("{" + p.Key + "}") >-1) {apiUrl = apiUrl.Replace ("{" + p.Key + "}", p.Value) } else {apiUrl + = string.Format ("{0} {1} = {2}", apiUrl.Contains ("?")? "&": ", p.Key, p.Value) }}); var req = (HttpWebRequest) WebRequest.Create (apiUrl); req.Method = "POST"; req.ContentType = "application/json" / / Defalt if (! requestBody.IsNullOrEmpty ()) {using (var postStream = new StreamWriter (req.GetRequestStream () {postStream.Write (requestBody) }} if (headers! = null) {if (headers.Keys.Any (p = > p.ToLower () = = "content-type")) req.ContentType = headers.SingleOrDefault (p = > p.Key.ToLower () = = "content-type") .Value If (headers.Keys.Any (p = > p.ToLower () = = "accept")) req.Accept = headers.SingleOrDefault (p = > p.Key.ToLower () = = "accept"). Value;} var response = (HttpWebResponse) req.GetResponse () Using (Stream stream = response.GetResponseStream ()) {using (StreamReader reader = new StreamReader (stream, Encoding.GetEncoding ("UTF-8") {resuleJson = reader.ReadToEnd () } catch (Exception ex) {return default (T);} return JsonConvert.DeserializeObject (resuleJson);}
This allows the Json data to be sent correctly.
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