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        before being able to upvote. Upvoting indicates when questions and answers are useful. (https://stackoverflow.com/help/whats-reputation) What's reputation and how do I get it?  Instead, you can save this post to reference later.     Save this post for later Not now           (https://cdn.sstatic.net/Sites/stackoverflow/Img/apple-touch-icon.png?v=c78bd457575a) (/questions/74371890/post-context-deadline-exceeded-client-timeout-exceeded-while-awaiting-headers) Post Context deadline exceeded (Client.Timeout exceeded while awaiting headers)  (/questions/ask) Ask Question     (2022-11-09 08:31:22Z) Asked 2 years, 4 months ago  Modified (?lastactivity) (2024-05-06 16:03:00Z) 10 months ago  (Viewed 54,238 times) Viewed 54k times         This question shows research effort; it is useful and clear  (70:3:31e,16:78ab1f34a1e72c42,10:1742103579,16:7c5ed716b49d7a8b,8:74371890,9d019918f43c99eac0285c28abeeabe4807f111dd87cbf75a0427bc8257693dd) 10  (This question does not show any research effort; it is unclear or not useful)    (70:3:31e,16:ede9f19d050eac12,10:1742103579,16:5d13fbdac13ca5df,8:74371890,38b3ba286d8db9b6d95861ca103d2139582b9975c614c1b527b37dabf2029052)      Save this question.  (/posts/74371890/timeline)    Show activity on this post.    I am running a simple query using Clickhouse HTTP Interface  package main import ( "fmt" "net/http" "time" ) func main ()  {

    url := "http://localhost:8123" + "?query=select%201" req, _ := http.NewRequest("Post" , url, nil ) // set headers req.Header.Set("X-ClickHouse-User" , "user" ) //user req.Header.Set("X-ClickHouse-Key" , "password" ) //password client := &http.Client{
        Timeout: 5 * time.Second,
    }
    resp, err := client.Do(req) if err != nil {
        fmt.Println(err.Error())
    } else {
        fmt.Println("Success" )
    }
}   It is giving me this error Post "http://localhost:8123?query=select%201": context deadline exceeded (Client.Timeout exceeded while awaiting headers)  Note: If I use insert query instead of this select query it will give me the same error but also will insert the data correctly. Any help would be appreciated. Thanks  (/questions/tagged/http) (show questions tagged 'http') http  (/questions/tagged/go) (show questions tagged 'go') go  (/questions/tagged/clickhouse) (show questions tagged 'clickhouse') clickhouse  (/questions/tagged/clickhouse-go) (show questions tagged 'clickhouse-go') clickhouse-go      (/q/74371890) (Short permalink to this question) Share  Share a link to this question     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/74371890/edit) () Improve this question  Follow (70:3:31e,16:f462e2d02eea7ddb,10:1742103579,16:a396f8700be41689,8:74371890,44454be74c25fab3cde61829f687dba31477931c0ff844f5b3eebfc92bceb438)  Follow this question to receive notifications       (/posts/74371890/revisions) (show all edits to this post) edited (2022-11-09 09:10:15Z) Nov 9, 2022 at 9:10     Zunnurain Badar     asked (2022-11-09 08:31:22Z) Nov 9, 2022 at 8:31   (/users/7608629/zunnurain-badar) (Zunnurain Badar's user avatar)    (/users/7608629/zunnurain-badar) Zunnurain Badar Zunnurain Badar (reputation score) 1,042 (2 gold badges)  2  2 gold badges (10 silver badges)  10  10 silver badges (34 bronze badges)  34  34 bronze badges        2   Probably is because you are setting the timeout on your side and the server timeout is longer than yours. In consequence the server may send a response after the 5sec that you are waiting for. – (/users/4963247/marcel-kohls) (1,897 reputation) Marcel Kohls  Commented (2022-11-09 11:17:48Z, License: CC BY-SA 4.0) Nov 9, 2022 at 11:17      (number of 'useful comment' votes received) 1   @MarcelKohls I sent the same request from the postman, Nodejs and it worked. it takes less that a sec to respond – (/users/7608629/zunnurain-badar) (1,042 reputation) Zunnurain Badar  Commented (2022-11-09 12:32:08Z, License: CC BY-SA 4.0) Nov 9, 2022 at 12:32        (Use comments to ask for more information or suggest improvements. Avoid answering questions in comments.) Add a comment |  (Expand to show all comments on this post)          1 Answer 1   Sorted by:  (/questions/74371890/post-context-deadline-exceeded-client-timeout-exceeded-while-awaiting-headers?answertab=scoredesc#tab-top) Reset to default   (scoredesc) Highest score (default)  (trending) Trending (recent votes count more)  (modifieddesc) Date modified (newest first)  (createdasc) Date created (oldest first)            This answer is useful  (70:3:31e,16:f0909468ff9464a2,10:1742103579,16:2ef0f9e9a3029628,8:74377944,28f54fa676b1f9ecbc5c7c4264fdcf981d547d0b746aa10748968ee3696e2183) 6  (This answer is not useful)    (70:3:31e,16:6f0ee134dec68753,10:1742103579,16:5b53e69ed44f7652,8:74377944,33abc527804cd5785a0e5a299b46b5b0d736382b4b085447a2436bf2bb707503)      Save this answer.  (Loading when this answer was accepted…)     (/posts/74377944/timeline)    Show activity on this post.    I did a quick sample here using your code, and as I suspected, locally this error only happens when the server times out. Maybe postman is doing something that hides this behavior. Also, don't forget that the http.Client timeout is for the entire request-response cycle that is constituted up of Dialer, TLS Handshake, Request Header, Request Body, Response Header and Response Body timeouts. Please take a look in the POC below and change the timeout() for different values to see the success (4- sec) or fail (5+ sec). package main import ( "fmt" "log" "net/http" "time" ) func timeout (w http.ResponseWriter, req *http.Request)  {
    time.Sleep(5 * time.Second)
} func server ()  { go func ()  {
        http.HandleFunc("/" , timeout)
        log.Fatal(http.ListenAndServe(":8123" , nil ))
    }()
} func main ()  {
    server()

        url := "http://localhost:8123" + "?query=select%201" req, _ := http.NewRequest("Post" , url, nil ) // set headers req.Header.Set("X-ClickHouse-User" , "user" ) //user req.Header.Set("X-ClickHouse-Key" , "password" ) //password client := &http.Client{
        Timeout: 5 * time.Second,
    }
    resp, err := client.Do(req) if err != nil {
        fmt.Println(err.Error())
    } else {
        fmt.Println("Success" , resp)
    }
}   you can also try to make use of specific http.Client timeouts as for example: c := &http.Client{
    Transport: &http.Transport{
        Dial: (&net.Dialer{
                Timeout: 30 * time.Second,
                KeepAlive: 30 * time.Second,
        }).Dial,
        TLSHandshakeTimeout: 10 * time.Second,
        ResponseHeaderTimeout: 10 * time.Second,
        ExpectContinueTimeout: 1 * time.Second,
    }
}   Some references that may help you: (https://blog.cloudflare.com/the-complete-guide-to-golang-net-http-timeouts/) https://blog.cloudflare.com/the-complete-guide-to-golang-net-http-timeouts/ (https://itnext.io/http-request-timeouts-in-go-for-beginners-fe6445137c90) https://itnext.io/http-request-timeouts-in-go-for-beginners-fe6445137c90 (https://gosamples.dev/http-client-timeout/) https://gosamples.dev/http-client-timeout/    (/a/74377944) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/74377944/edit) () Improve this answer  Follow (70:3:31e,16:a46b9100e8f7a63e,10:1742103579,16:79b753ce133963f3,8:74377944,b00db9a3d2ad2897c37d26847270f9f96b3226f80317177fe6fd47d060f36a0d)  Follow this answer to receive notifications       answered (2022-11-09 16:04:10Z) Nov 9, 2022 at 16:04   (/users/4963247/marcel-kohls) (Marcel Kohls's user avatar)    (/users/4963247/marcel-kohls) Marcel Kohls Marcel Kohls (reputation score) 1,897 (20 silver badges)  20  20 silver badges (31 bronze badges)  31  31 bronze badges        1   Very helpful !!  I was earlier setting overall Timeout in the Client struct. This did not take care off the scenario when we are uploading large files on slow internet. Instead now shifted to using ResponseHeaderTimeout in Transport struct – (/users/2469308/madhur-bhaiya) (28,874 reputation) Madhur Bhaiya  Commented (2024-12-21 09:29:38Z, License: CC BY-SA 4.0) Dec 21, 2024 at 9:29        (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) Add a comment |  (Expand to show all comments on this post)          (74371890) (false) () Your Answer  (True)                                                    Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question . Provide details and share your research!  But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience.  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